It’s simple. It’s not more popular because of bad UX.
I would not be surprised if the best customer that Vercel chasing is also a customer that can add these costs to their customer or take a hit on the margin.
Is it possible to sync the calendar with iCloud and Google? If yes, both ways? We have shared calendars in our family and don't want to use an external app to see whats up but happy to the planning in upbase ofc.