One way could be to have a more cooperative-like application. Let's say you join the cooperative by signing up to the application, and everyone agree to automatically help seed each others notes.

Another way could be to have small cooperatives inside the application, based on groups/organizations. So you sign up, apply to an group and everyone in the group help seeding each other.

Yet another way could be when you sign up, you'll just seed your own notes. However, if you pay 1 Euro per month, the maintainer(s) of the application will help you seed it. Or combine this with the group-idea and have groups announce their re-seeding possibility on the network, and pay the group.

Neither of the ideas are perfect and serve just as examples of what could be possible.

Btw anilgulecha, I would interested in participating in a discussion about it, and you might want to raise it as an issue on https://github.com/ipfs/notes, lot's of people who care about the same thing there.