I’m a new user, so my opinion counts as such. My first concern upon signing up was understanding which communities I was allowed to see from which instance. Maybe a page where people can search by communities first and then show them where they are hosted/federated could solve this issue. Also, improving federations between servers could ease the signup process too. If any server allows communities from most other servers to be viewed, choosing what instance to join will be more a matter of personal beliefs and tastes than else.

I’m afraid that setting a default instance could cause it to experience explosive growth and monopolization of the communities. As someone pointed out in a comment in another post, while users on Lemmy are growing, donations are not, so the bill for a single instance with all the people on it will probably be huge. Also, if all the largest communities are going to be on a single instance, how difficult will be to create new original ones to bring some people to the small servers?

Captchas are bad for privacy. They allow the provider to track users between websites, and they are also bad for people because they are generally hard to solve for people with impairments. Also, automated solutions to bypass captchas exist on the market.

Also, I believe a network with high-quality content is better than a bigger generalist one. A little barrier of entry and manual screening of people may serve well for this purpose, so I’m favorable to keeping it.