It’s optional. There are specific events (WTRL TTT, ZHR Masters, etc) that rely on this being turned off.
I think I went a bit OTT on that point. What I was trying to say is that Zwift sanctioned events are likely to pull attendance away from some community events and by removing (assuming we have) some Zwift Crit City races, this will free up the attendance to compete in Community events.
When I say Community Events I’m referring to ones organised by members of our community, rather than us or our marketing partners / federations.