I don’t believe that for a second. Some specific apps are only on one platform or the other but every app has a ton of alternatives that do the exact same thing.
I’m not sure if you are trolling, shilling, astroturfing, whatnot but either way that argument is disingenuous at best.
It’s not that easy to steer clear of. I’ve bought a couple of books on other topics from Amazon and realized when they arrived that they weren’t worth the cost of the paper they were printed on. It’s easy enough to notice it’s bullshit, it’s harder to avoid spending money and time on them in the first place.