WinAmp making their source code 'source available' instead of open source, and then dropping this phrase:
The release of the Winamp player's source code will enable developers from all over the world to actively participate in its evolution and improvement.
Yeah I don't think so
For example terraform changed their license to a non open-source license, and everyone hated it. Then a fork was created, which used the code before the license change which was still licensed under an open source license. The fork "OpenTOFU" is now 'owned' by the Linux Foundation
https://opentofu.org/blog/opentofu-announces-fork-of-terraform/
Same for redis, there is also a fork called Valkey now, which is also 'owned' by the Linux Foundation:
https://redis.io/blog/redis-adopts-dual-source-available-licensing/
https://devops.com/valkey-is-rapidly-overtaking-redis/