That has nothing to do with hardware accelleration. I can not tell what the problem is exactly, but it has to do with loading files.
So some cookie stuff, redirects, http instead of https and other obscure things that should throw a error message to the user, but don't.
For the first game, try loading it in Firefox. The unity will not load, the loading bar will not move. Then open the console on FF and look for errors. There is one where some error message about "no-referrer-when-downgrade". If you click the hwcdn link directly, the game runs.
Maybe the file hoster or itch changed some configuration, if games did run previously. Sounds like a combination error.
I did not try the other games, if they have the same problem.