Steam/Valve follow the law: https://www.theverge.com/2024/10/11/24267864/steam-buy-purch...

So they avoided having a "rent" button by using the technically correct "add to cart", "continue to payment" instead of "buy this game", "buy all games in cart", and just have a separate sentence in small grey text that is confusing to most people.

Clearly this law needs to be worded harsher, so the button MUST say "rent" if you are renting.