I can think of better ways of promoting Imgflip: Like making original, non-spammy content

Lots of streams that allow one or more of those.
imgflip.com/m/StreamAnnounce

I’ve already banned them from posting in dark humor, memes overload, rickroll stream, and comics

Ikr

Cyber bully the one who helps us promote imgflip but fails to do so.

can you explain