No one is stopping you from hosting your own instance and doing just that.
I’m sure people will just love it when they’ll be told that they can move from Reddit to this brand new decentralized social network for the small fee of 5€/month to pay for their own VPS hosting their own instance (provided they are also experienced sysadmins). I’m sure that will not hinder the platform’s growth at all.
Make each user function as an instance, to solve the mess of netsplits/defederation.