It took a few days for instances to be upgraded and admins to fill in their profiles but it's looking much healthier now!
Yes, it's quite common but I don't want to show that information as it'd make life too easy for spammers.
Anyway you can use a throwaway email service like https://sorry.idont.date/ and even if they have registration applications turned on (many don't) and the person processing your application notices you're using a throwaway that will just be one factor in the approve/decline decision.