This requirement is designed to be hard, and as such is a major red flag to me.
What else is this company going to be difficult with?
Can i only get customer support or cancel my account in person, between 9-4 on the 2nd Friday of the month?
I would consider alternatives, if possible.

Think about your audience and the specific features that will potentially appeal to them.

Depending on who that user is, the same feature/quirk can be either a pro or a con.

There’s lower user numbers here compared to something like Reddit, but the people involved tend to be of an average higher tech literacy.
So there’s not as much noise, but there’s also not as much signal.

As a user, you can spin up your own instance, which gives you complete control… But it also introduces a financial and moderation expense, not to mention inherently leading to fractured communities.

Just look at the Android discussion, it’s occurring on at least:
Android@lemmy.world
Android@lemdro.id
Android@lemmy.ml

etc etc

I’ve read Revelation Space and Chasm City.
I’m sorry, but they are a massive struggle.