People rarely "vote with their feet", that's a myth used to justify a lot of crap that's happening in the world.

People follow the herd. In terms of collaboration tools, they use whatever tools everyone else uses, and often get stuck with bad solutions because of network effect. Just how many companies use Skype for group chats? In each case you could probably trace it back to the CEO / upper management needing it for actual video calls, who then force this tool on the employees and because it has some group chat capabilities, nobody bothers to switch to something better. I've seen similar things playing with other tools as well. It's not the good one that wins, it's the first good enough that does.