Wow, this is awful. Some people reported that these ads are also very petty and not necessarily related to the game, like apparently Elden Ring shows an ad for a licensed mousepad when you hover over the game now…
Edit: Playstation Product Manager says this is actually a new bug. I really doubt it but they do seem to be “fixing it”.
To be fair the Steam Deck is similar to consoles, it is only one piece of hardware that people can’t alter (or aren’t meant to) that natively runs on a Linux system and is entirely designed to work as such. I think the Steam Deck is an interesting concept, but I don’t believe it can be compared to custom built computers, as well as the idea of supported games on any choice of Linux distribution. Support is significantly better than it used to be, but it’s still such a long way off.
While it defaults to a console-like experience it is meant to be altered, they give you a full desktop environment as standard and even provide instructions to install Windows if you really want.