>Maybe they have big customers that communicated to them that they will choose them over the competition if they open more of their software stack. I do rememb

>Maybe they have big customers that communicated to them that they will choose them over the competition if they open more of their software stack. I do remember reading that that is the case for AMD, maybe one of their open source devs said it in an interview? They've also been doing it for a long time now and the risks didn't seem to materialize, which surely helps with all the fears that you mentioned.