TLZ
Banned
They haven't because is too obvious. Just look at what the Pro does. It plays all your PS4 games, and you can turn on boost mode for them to take advantage of. But they have a disclaimer that some may have issues, which I haven't seen so far.The hope is this only applies to a boost mode, and not to games in a regular BC mode. But they haven't said that yet.
So just use that as reference. Play your PS4 games on PS5 as normal, and you can turn on boost mode of you like, and comes with a disclaimer. Same approach.