FSF

I just thought a bit about the restrictions the GPLv3 allows, and I think I just understood their purpose and effect for the first time (correct me, if I'm wrong :) ).

What are the restrictions?

The GPLv3 allows developers (=copyright holders) to add selected restrictions, like forbidding the use of a certain brand name or similar.

The catch with them is, that any subsequent developer who adds anything is free to simply strip off the restrictions.

What is their effect?