IIRC, at least around the time Apple Silicon was introduced, they were running some kind of taskforce to make code contributions to key open source projects to ensure they were compatible.
Did they? They provided pre-M1 mac minis (aka DTK), but I don't know that they actively contributed code. I don't remember seeing code from them for Firefox, at least (I was involved in getting Firefox to work on Apple Silicon)
They did for obs[0], didn't see any other projects (I just remember I saw it a while ago, I may have missed other software if they tried).