Yes, nobody says that there's something illegal here. Were it so, Redis is high enough profile project for someone to take a legal action.

But this is a takeover that is slowly draining the value from the community and directing it to private pockets. E.g. Redis is now source-available.

There are still compatible alternatives: https://valkey.io/ (C, a direct Redis fork) or https://keydb.dev/ (C++, an evolved Redis fork), both BSD-licensed.

I wish RethinkDB was more alive :-\