Fines for $xx billions for messing up COPPA compliance like in Silicon Valley(the HBO show) is probably not real: https://youtu.be/JNuTcsp4SvA?t=40

But what's something more realistic that actually happened before?

My specific website has user generated content which blows up the legal complexity a lot (intellectual property rights, DMCA compliance, user accounts which means GDPR stuff).

Is there any scenario where I can't just fold up shop and run away? Do I need to be doing the project under some LLC?