License as copyleft?

[ThinkChaos]

Hi,

Thanks for all the work that's been put into this. I installed it earlier this week to try it out and I'm convinced it could become one of the more popular music servers out there!

There's still some rough edges which I'd love to help soften, but I'd rather not contribute to something MIT licensed because that means my work can then be used by others without them giving back anything to the community.
Would you be open to re-license this as copyleft?
AGPLv3 seems fitting since this is server software.

I figured I might as well ask since this is a relatively new project, and there are only 2 contributors ATM.
That could also easily be brought down to just @cwilvx since the second contributor provided the Dockerfile, which I noticed issues with and was thinking could be changed to use alpine instead of ubuntu.