I just gotta say, I hate it so much when developers using a game engine like unity or unreal, which are packed with so many features, they can't take the time to press 2 more buttons to export it to web or linux. What's the holdup? Why just export to windows, it's not like this game uses platform specific features that only work on windows, you're literally just lazy.
The reason people do not export a game to Linux or mac is because if you do not own that computer, sure you can still export it but you will not be able to playtest it, and then you will get a buggy mess. The reason people do not export to the web is that it can be quite challenging to get it working and it takes a lot of time. So to sum it up it doesn't just take two more button presses. Game dev takes a lot of time.