I've been studying and thinking a lot about Cloudron use-cases.
Something that bugs me is how the Microsoft/Apple/Google expectations for schools and children is very exclusive for low-income parents.
I can see that a lot of users here are also hosting and sharing with family.
I wonder if you'd consider a Family/Educational licence tier?
Maybe something like €5/m, given that there's still the VPS and domain to pay for.
I'm thinking it could be full-function, except being limited to just one domain.
I just know parents that don't have landline internet or premium services because feeding the family comes first but then they are expected to pay for expensive software and operating systems for their children not to be excluded from learning technology.
You might have to assess how many users that might already include that might expect to change to this tier.
I suppose it could have an additional approval process for the domain being a personal family domain and not a commercial organisation.
It's your business, so your prerogative, I just wanted to note the thought, not as a campaign against your model but just as a consideration alongside all the many other things you consider.