“We fully expect to continue offering the Zulip Cloud Free plan indefinitely” doesn’t exactly garner confidence from an article written by a competitor. SMH.
From my point of view there's a world of difference between "we fully expect to continue offering free indefinitely" and "free forever". In the first case, they talk about their expectations, while the second case is a promise. Also "indefinitely" means that the end is unknown, not that it's forever.