Subverting GPL

I have a few ideas, how legal are these:
1. submitting code requiring a 1000$ compiler or 1000$ language docs
2. submitting asm code as "source"
3. making deliberate errors in code or inserting bugs.
4. altering source code to make it look like line noise.
Not that i like to do any of this, just checking what is possible to do with my code.

There is a simpler way that I've seen used in the wild:
Create a server that contains the GPL'd parts, and a client that is closed source. If a server is too much work, just a separate executable (not a library). Publish server source code (modified or not) if it has to be ran locally, don't if it's done remotely.

AGPL can prevent this kind of abuse partially.