It's hard to say these days. Probably not. As JCP pointed out, a lot of them wrestle elsewhere as well in order to supplement their paychecks. There's a lot less of that going on right now though. ROH does send guys to CMLL and New Japan where I'm sure they get paid better, but besides that there's not much in the way of outside bookings. It may be because that's enough work for them to make bank, and it may be because as flexible as an ROH schedule is, there really isn't much time to do anything else if you're doing a Japan tour or in Mexico, especially since there's such a divide in their territories. You get the odd PWG booking here and there for the likes of Jeff Cobb, Marty, and Bandido, but I think those are even drying up. I think ROH has found a nice financial balance for their talent with their promotional pacts though.
Anthem's another story. I don't know what the current inner workings of Impact Wrestling are. I know that oVe is everywhere, including a promotion called Rockstar Pro in Ohio that the Crist brothers own. Sami works there occasionally along with MLW, same goes for Daga, the Lucha Brothers, and Rich Swann. The Rascalz are all over the place, Johnny Impact has amassed a cache of new last names by wrestling pretty much everywhere and proclaiming himself Johnny [Insert Promotion Name Here]. Willie Macks' everywhere and blowing up. Su Yung spends a lot of time in Fest Wrestling in Florida and shows up for occasional Queens of Combat in N.C. I haven't seen Tessa making the rounds, but it could be a blind spot. LAX pops up places as well.
I've said for awhile that I find it hard to call Impact Wrestling's talent pool a roster since it's hard to say whose there on behalf of another promotion. It's a bit less hazy now that Lucha Underground is pretty much not a thing anymore, but their talent's far from being exclusive or "Impact Originals".