@asie I have pledged to carry out a GNU/Jihad against all forms of proprietary software, including "FOSS", but I assume you actually mean free software.

A user who doesn't pay or contribute are not a cost - as an extra person running a copy of software does not cause any kind of wear to the software - they are simply users who you are helping, some of which who will choose to help you.

No free license allows a developer to "kick out those who annoy you", although any free software developer is to not take messages or ignore such from people who annoy them.

A fork under a free license that states that it is not the original is never hostile.