Shrouded Scribe@siina @Polychrome @lanodan Well, let's see if we can get an answer... @Vivaldi were any accounts ever added to the Vivaldi Social mastodon instance without an opt-in step? Were profiles created even if they had never logged into Vivaldi Social?
Banned 
Vivaldi Browser@shroudedscribe @siina @Polychrome @lanodan Bit of a late reply, we're sorry.
The answer to the question is no. Logging in to Vivaldi Social specifically is required for an account to be registered there.