Iirc some JP instances do not federate with EU hosted instances because they don't know how GDPR will affect things. Learnt about it in one of the instances I was in previously

I was shopping for instances n there was one that refused EU ppl from signing up

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either they region block or just write the rules but don't enforce

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Fedibird

様々な目的に使える、日本の汎用マストドンサーバーです。安定した利用環境と、多数の独自機能を提供しています。