Steam's Next fest has brought back some demos on PC. You might not get a demo for a big IP, but you can try lots of smaller dev games without having to buy first.
I’ve noticed that! A lot of smaller games/indie titles offer demos or some kind of limited time trial. It’s almost like the people making those games get me 🥹
I remember playing Destiny's Alpha version when I was invited to it. It was a fun experience but sucked when the game was mostly a let down for the first year or so.