Twitter is a platform… all your data, followers, and follows are confined to the platform. The client you are accessing Nostr on is just a tool to read and write to the protocol layer, so if at any point you want to use another client (primal, iris, snort, fountain, zapstream, etc.) all your data, follows, followers, etc go with you. As a common user that was banned from a platform for following a page that was recommended to me by the platform, losing all my data, followers, and follows of 8 years; I like being somewhere that it can’t be taken from me.