The videogame industry is a multi-billion dollar industry. However, there are thousands upon thousands of games that can be played for free. I am not only talking about free-as-in-freedom games, but also about old arcade games, console games, etc.
If you use GNU/Linux, you can install many videogames using the package manager of your distro. Other games are distributed in Flatpak, Snap and AppImage formats or must be compiled. To find free games I recommend LibreGameWiki.
However, we don't only have free games, but thousands of old arcade games, which can be played with Keep reading Do you buy video games? I've got more than 6000 for free