Lots of card payment details leaked in this one - a lot of the articles are trying to downplay it, but it is clear that these details were leaked and were used for fraud.
No, not entirely. According to the e-mail I got; the breech affected logins happening between February and 23 June of this year. GDPR kicked in on the 25th of May.
But I'm no lawyer, so I'm not sure how it plays when stuff hits the fan before the law comes into effect.
Monzo did a good writeup on it: https://monzo.com/blog/2018/06/28/ticketmaster-breach/