They don't tend to "kill" the original, they just force them into "source available" licenses. Wikipedia has stuff like MariaDB, MongoDB, Sentry, Redis, etc. as some examples.
Redis was relicensed as "source available", and then that license change led to a fork. But the most prominent fork isn't proprietary. It's a permissive one, called Valkey: https://news.ycombinator.com/item?id=44653130. That's actually a good example of an in-demand permissive project changing maintainers and staying relevant under a permissive license.
An interesting thing to see in the future is whether Redis ("source available" + AGPL) or Valkey (permissive) "wins" in the long term.
Too lazy to google the details regarding the other projects.