You can access almost everything, but some instances are either defederated, or federation may be unreliable at times. You may also wish to create communities on another instance for whatever reason. For now, you’re prolly fine and then you’ll see.

only reason I made several is to “claim” my username on different lemmy instances. I’m hoping at some point I can merge or link them somehow

In general no, you can see everything from one account. The reasons for having multiple accounts are approximately the same as for Reddit, such as having a NSFW account separate from your regular account. The only additional concern with Lemmy is that some instances defederate from each other. Unless your account is on the instance that’s defederated though, it won’t affect you.

I created multiple in case some instances were to shut down or become unappealing over time. Otherwise, there’s no particular benefit.

I created one Lemmy account first, then a week later I discovered Kbin. Since there are currently some federation issues, I’m checking in on both accounts.

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