The user should be addressed more professionally or indirectly so "man". "Du" is more "dangerous" and inflexible.
Can be mentioned briefly I would think, but going into length about it should have an own page. Different content should have different headings.
Don't see an issue with that. This should imo have an own heading too then. At the same time we don't need to advertise ourselves specifically like a company.
Currently the main page is empty. The goal is to fill it with information about Diproche and the interface.
Some points that should be agreed upon include: