I for one will always be concerned that in trying to make a public world private, someone made a coding error. You can CLAIM to have bolted on privacy, but that's a statement I would have to take on trust because I lack the tech skills to read the code and verify.

I don't like trusting much. Obviously I have to at times, but that means that for private stuff, I go to things designed ground up to be private.

Obviously you can , and should, build whatever interests you, but if you have other ideas more suited to a public realm, maybe they would be better.

All the best