Darxium

It depends on the game, although the overall situation has improved recently. Multiplayer games tend to have more issues due to their anti cheat software, which often doesn’t support Linux.

I recommend you check these pages for compatibility in your preferred games in case you want to try:

• protondb.com
• areweanticheatyet.com

If anything someone caring too much about the OS another person is using is a more reasonable red flag IMO

If it’s an Android and using Gboard you can go to the symbol tab and hold - to choose the · symbol.