That's fine if you don't mind ads. If you don't like ads, you may opt for a less polished experience without ads. The power of Nostr being an open and permissonless protocol is that it empowers the user with choice.
Discussion
True, but email is also a protocol that doesn't necessitate advertising. And still most users have chosen to be the product that's sold...
Hopefully the possibilities of micropayments via lightning will create viable alternatives!