Going by something like Glory ESPN ratings you don't really see growth. Or maybe if you think of them doing more events now than they did before, even with smaller ratings per broadcast in total it maybe somewhat evens out.
But looking at it overall let's say just post 2016 we've had GoH that sprung up. That's a completely new entity on a new pretty big TV channel that didn't exist previously and they did something like a couple hundred fights in a bunch of countries last year. Main guys there make good money.
Emei done okay and seemingly growing.
We've had Bellator kb start up, they pay at least the main guys pretty well and that's another okay channel broadcasting kickboxing with Spike/Paramount. ONE Championship is starting to do some kickfighting. Probably broadcast somewhere?
K-1 definitely been growing and moved to bigger arenas.
Guess you could look at Glory too and overall, and specially in the US, they have some more butts on the seats at the events. They're on TV in more countries again also.
Kunlun on TV in more countries than a couple years ago and in English.
Enfusion has grown. WFL in Dutchieland seemingly done pretty okay too and that's new.
Only thing I can really think of that kb has lost recently was Eurosport that aired a bunch of promotions and the lack of that has seemingly affected at least a couple promotions a bit.