Welcome to the real world. If your little hobby project leaks the personal information of a real person, then they don't care how much of an unimportant side project it was to you.

For purely personal use "hey guys, this is just a hobby use at your own risk" you won't get hit with gdpr

Imagine if you were building cars for a hobby then selling them. Would you complain about all of those onerous regulations like seatbelts, crunch zones etc when all zou really want to do is tinker with some cool engine tech?