Probably? They already fucked off from Steam when EGS offered them money bags. None of their latest releases are available on Steam. We now know that the overwhelming majority of EGS exclusives failed to recoup the investment for Epic (so the devs end up making no additional income and often stop promoting the EGS version altogether once the Steam release happens lol) but in Ubisoft's case they still had uPlay to fall back on. So I think it's very likely that of all the companies that got in bed with Epic, Ubisoft are the ones that made out like bandits.
I expect them to come crawling back to Steam eventually (EA finally did) but they can stay on the EGS for all I care. AC Valhalla is pretty much the only game I'd probably end up buying if they returned to Steam. And honestly, I've wanted a new Splinter Cell for years now but with everything surrounding Ubisoft over the past couple years I honestly couldn't give less of a shit right now. I don't trust the current Ubisoft to make a decent stealth game.