Not ethical: If you have to submit assignments (like .docx files) online and you haven't finished it in time, take a random .docx file and edit it in a text editor (like notepad) and add/delete some random stuff. You can send this file and the professor won't be able to open it so you will get an extension by default.

Worse. You can't turn it off :/

Wow. Nice! How's the adoption in masses? Do they use/prefer foss?

Nvidia GPU I'm assuming? Make sure nvidia (or nvidia-dkms), nvidia-utils and lib32-nvidia-utils have the same version and are up to date. This issue is listed in the Arch Wiki see if it's helpful for you.

The Indian UPI System is a pretty great for this. I wish more countries adopted it/built something similar instead of relying on corporations.