Why not, they're HBO. Things like this should not have happened so frequently. I recall we had this incident with S6 GOT? or was it 7?
https://www.thequint.com/neon/web-culture/game-of-thrones-episodes-leaked-timeline#read-more
It happens sometimes, but it's never a good thing for HBO. The leak didn't bring any more attention to the finale, that's basically impossible. People who were going to watch it watched it, except this time some of them watched the leak instead of watching it on HBO/HBO Max.