I think that's actually what discord should be used for. It's one of the better platforms for voice/video/text chat. It's mostly just when people use discord for what should be a public forum or wiki that it becomes a problem.

And sure, it's not a great place for open source developers to do all their communication in, because being able to reference things in the future if a project lead closes the server is important. But it's probably fine for coding sprints and meetings here and there as long as someone is taking notes to be documented elsewhere. Discord is arguably better than zoom for that use case.