Two months ago I visited Primal by accident (which appears to be some Nostr instance) and the first impression I've got it's a platform for promoting crypto because streams were just about bitcoins all around

Last year one of users on mastodon I was casually talking to decided to move to Nostr - he claimed in his last posts that some features like pools and voting are locked behind payments there. Can someone shed some light on that? I couldn't find any info if that platform does contain paid features.