A roulette wheel of random instances is certainly a solution, but it’s not a great one, given that there are substantial differences between instances that could potentially impact a user’s fediverse experience, such as who they’re defederated from, whether they allow nsfw or downvotes, etc…
Its already solved, you get an automatic instance suggestion here: https://join-lemmy.org/
A roulette wheel of random instances is certainly a solution, but it’s not a great one, given that there are substantial differences between instances that could potentially impact a user’s fediverse experience, such as who they’re defederated from, whether they allow nsfw or downvotes, etc…