There are a few different “groups” looking to build race communities on zwift

Cvr is a pay to enter, race series (do they profit from it too maybe). $ goes to winners and cool events like the championship series

Kiss has their own weekly crit championships. Doesn’t cost anything to enter and way less structured - just hop on and ride in as many races as you can

Kiss, WBR and others are zwift racing groups / teams that run their own weekly races.

In general the different group organizing the race doesn’t matter. Each have their own rules (re: things like starting all cat’s start together, or A start before B before C, etc, powerups, length of races, etc)

I race whatever fits my schedule, am indifferent to the team organizing