HashiCorp is the latest big name to do it—they switched to the BUSL, which more or less says you can only use the product if you aren't offering it for sale in competition with HashiCorp:
Doesn’t this turn on the definition of competition (in the license). I remember reading about a bunch of game and server tech being in very murky water following the license change.
If they ever decide to enter your specific business they have an automatic kill switch on you.
https://www.hashicorp.com/bsl