Hacker News Reader

In what ways? Are they going to implement federation or E2EE?

> It's open source (not open core or source available)

Mattermost is fully open source. I pointed to the GitHub repos which contain the entire client and server systems.

Mattermost is open core. There are features that aren't available in the open source version and which you have to pay for https://mattermost.com/pricing-self-managed/

Can I make OpenSSL also disqualified for the open source title, requiring everyone to call it "open core", if I sell paid features on top of OpenSSL?

I really don't see the difference between open core and open source if the "core" is a fully functional standalone product.

Will OpenSSL reject properly implemented features contributed by third parties, because you sell paid features on top of OpenSSL and said contributions happen to make your product redundant?

That's the difference. Mattermost won't ever accept contributions, that reimplement features from their paid product. If you want to use such features, you would have to fork, and forced to keep the fork public, since it is AGPL.

Reply on news.ycombinator.com