Instances are great, but are also a problem for onboarding.
Is there a single point of entry for people now? I can imagine there being a website people could go to that asks a few simple questions and sorts (or load balances) people to certain instances. This would of course need some way for people to transfer their accounts in the future should they not be happy with their instance. Additionally each instance would need to have some kind of API call for the single point of entry to create the accounts You could even have a simple survey to gauge people’s interests to help them in the community filtering process and present the mobile apps that are available.
Just some thoughts of course on how it might be possible to improve the users first experience.