Sony may not do it, the same way Nintendo might not do it either, but both reserve the right to do so
Edit: If you take a look at the PLAYSTATION®5 SYSTEM SOFTWARE LICENSE AGREEMENT under "6. VIOLATION OF AGREEMENT; TERMINATION OF RIGHTS AND SIE INC REMEDIES", one of the possible actions they may take states:
disabling use of this PS5 system online or offline
I used mine just a few hours ago while playing Brotato. I'm usually not a controller guy and try to stick to mouse and keyboard but in cases where controllers are just the better choice, I strongly prefer the Steam Controller over any other one.