You are only making it harder for muxtape, not the RIAA.
There is no question that RIAA is no angel, I'm just saying you're complicating it for muxtape and the direct result might be them not being able to provide an awesome service or them having to make it much less attractive.
If this is public, muxtape potentially shuts down; RIAA does not change its unethical practices. Think about it.
Why should muxtape get to do something unethical when everyone else has to follow the rules? You're basically saying this is ok because no one knows about it. Is it ok for me to steal something from a store as long as no one catches me doing it?
Perhaps a better way of going about this would be to contact the muxtape developers directly, however like you said before, they already know about this.
Also, in this situation, the RIAA would not necessarily be doing anything unethical to shut down this site. They are hosting free music on the internet. Can you think of a more straightforward way to break copyright law?
There is no question that RIAA is no angel, I'm just saying you're complicating it for muxtape and the direct result might be them not being able to provide an awesome service or them having to make it much less attractive.
If this is public, muxtape potentially shuts down; RIAA does not change its unethical practices. Think about it.