You'd think so, but I've been hosting MM for about 6 years, and it's definitely gotten more user- and admin-hostile in that time. They've restricted really vital improvements to paying customers (basic stuff, like having a functioning search), removed existing features (like video calls) and started shoving in more advertisements and nags to upgrade to a higher tier.
The fact that they've ramped that stuff up so much in the last couple years does not bode well for the future, in my opinion.
My installation isn't associated with a business, it's just a chat board for about 30 people, so there's no question of me being willing to pay $300 a month for the privilege.
I'm sticking with Mattermost because there's no better option, and I've got hundreds of thousands of messages I don't want to lose. However, it isn't like they don't try to extort you just because they're better than Slack about it.
For what it's worth, Zulip has a Mattermost data import tool, and communities are an important use case when we set product direction.
While I can't promise we won't ever change our exact monetization strategy, we're not venture-funded, and thus are immune to the usual enshittification pressures. https://zulip.com/values/ has some context.
