Ok, but what stops same from happening with any other solution? There are two things that would "fix" it:

* Fully open and interoperable protocol: We had it (XMPP), it was flawed, but at one beautiful moment in time it worked and using same protocol I could contact both google and facebook contacts. Then the companies decided "no, we would prefer to keep a walled gardens rather than make it easy to move to competition.

* Fully open source (no open core nonsense, latest Mattermost rugpull from OSS part users being one example why) chat platform with corporate backing and SaaS option - there is Matrix but afaik it is lacking feature-wise, tho I havent used it much. With plugin app store so it is possible to make and even sell integrations with other systems.

Second option seems more viable but it takes a lot of effort to make something as good as Slack or Discord