Is it legal to use Bubble for my app in Europe since the server is located in the US?

If you mean EU countries GDPR is the main guide and it’s not that it is illegal to store data outside of EU - it’s preferable by users to store them inside EU; GDPR is more about how do you store / secure them and making sure that your users are aware of that for which you need a privacy policy.

You check more details here Bubble GDPR Intro Guide - Bubble Blog

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