Because it is built on top of Wine. The difference is when you try to run a game on just Wine you'll often have to do some fiddling on the command line or in c

Because it is built on top of Wine. The difference is when you try to run a game on just Wine you'll often have to do some fiddling on the command line or in configuration files to get the thing to work, if at all. Proton is much less fiddly. Stuff more often than not just works from clicking start.