Twitter fined ~$550k over a data breach in Ireland’s first major GDPR decision
techcrunch.com
techcrunch.com
Hopefully, Ireland’s Data Protection Commission intends this to be a "shot across the bow" hinting at more severe fines if Twitter continues to do this kind of thing. Otherwise, Twitter is unlikely to change their behavior.
It's been a learning curve, and things like this have been good lessons to bring us to where we are.