I am the author of Blowater client and here is my take

1. I will do it. I will monetize on Nostr.
2. Basic features of Blowater client such as DM will always stay free as long I can afford the development of it.
3. I will explore monetization in other areas such as premium client features(collaborative editing), premium relay features, zapertizing and e-commerce over Nostr.

Right now our team is still working on the foundation and we haven’t even integrated zap yet.

Last but not least, I don’t consider bitcoin the only true way of payment. I consider Nostr a good architectural pattern for SaaS and fiat payment will open door for many non crypto users. Whether they choose to opt in bitcoin is up to the community influence instead of a forced decision by developers.