H264 is controlled by the same consortium as H265. The only difference is that many of the h264 patents have expired over the last couple of years.

The free version of davinci resolve still doesn't include h264 support - presumably because they don't want to poke the bear. (h264 still works on macos because apple pays the licensing fees, and resolve uses the macos encoder & decoder.)

Lucent v. Microsoft, $1.53 billion over MP3