[marcinzm]

As I read it specifically doesn't cover things which are not economic activities and not professional activities. You running a website yourself and not as business may or may not fall into that. It is not necessarily the colloquial definition of personal.

A personal website may have donations, may have ads, may act as advertising for your professional career, may be used to find jobs for yourself, may be used by people to trade items to each other, etc, etc. Those may be covered by GDPR and without a lawyer (ie: money) I have no idea.