The most recent research I've encountered about probiotics is that they generally don't do much for people (aside from making profit for those selling them). They can have beneficial effects in specific circumstances, but not what the marketers claim. For cases where they do help, I expect that price and convenience (not refrigerated), and effectiveness are mutually incompatible.
That recent "research", if we are referring to the same release, was kind of laughable. They made no differentiation between strains, and it is strange to suggest the piles of research done showing clinical benefit are all lies. It is a little silly to cast off a whole segment of therapy like that.
Grocery store probiotics ("now with 18 strains!") are probably pointless for people seeking specific positive health outcomes, because many strains are antagonistic in nature and effect. Some strains will increase things some people already have an excess of. But many people, including myself and many on this very forum, have tried and gotten good results with specific strains.
For me, Miyari 588, lactospore, bifantis, florastor, bacillus natto, have all seemed to help to varying degrees. I get zero noticeable good effect, maybe even some negative, from common lactis strains found in most products. In the ones I take, some are cheaper and help more, some are overpriced and have less noticeable effect, but I still take them because it is like pieces of puzzle for me. The branded patented ones are horrifically overpriced and underdosed, this I recognize, and it would be nice to figure out if using them as fermentation starters actually gets a similar positive benefit.
Prebiotics from diet and supplement are just as important and effective in their own ways, too. Resistant starches, GOS, FOS/inulin and now HMO (human milk oligosaccharide) all shown to increase beneficial gut bacteria, depending on microbiome parameters.
To call probiotics as a whole ineffective is as inane as calling all vitamin and mineral supplements ineffective. Something I would expect to see posted on Reddit, not here, tbh.
There are some specific probiotic formulations I have my doubts about, like a popular soil based spore forming blend, but that is more manufacturer/company shady practices and lack of solid research, than a dispersion of an entire type of product. There is a UK based company whose name escapes me, and they put out specific single strain and even multiple substrains of each for specific issues. Even bacteria of the same genus can have different therapeutic uses. You can see this with the various different patents and brands of the same named probiotic, but different subtype, you just have to research and try them to see if they are helpful to you.
If you want to educate yourself, look at the actual research papers and learn to interpret them meaningfully, as relying on media releases to sum up papers for you is a fast track to the sheep pen. I am still a little shocked that that media release I am referring to was taken so seriously by so many, if you are in fact basing your assertion on that specific release. There is still questionable research put out, so it is on every individual to vet their sources and do their own experiments. It is not always so simple and black and white as good or bad for these things, but many folks really do think that way, especially when it comes to "alternative" therapies. Whenever I hear anyone trashing the use of the term "toxins" or the whole of functional medicine or naturopaths in favour of allopathic care totally, I know I am not dealing with a fully rational educated and experienced person. We can all pick and choose what suits our health goals and preferred outcomes from a variety of disciplines and therapy types, rather than saying an entire segment is worthless.
Btw, there are plenty of effective probiotics which by nature are temperature hardy. There is research showing a certain branded strain of bacillus coagulans is still quite effective after being nearly boiled and held at scalding temperatures for hours, and it has been shown to increase bifido strains in the colon, which in turn have been shown to produce positive health outcome promoting conditions for a variety of conditions as well as otherwise healthy people. And major reputable companies only claim what the research allows them to claim. If you have doubts about the veracity of the claims, vet the actual studies yourself.