Lufthansa success on DUB FRA nog at all surprising . I used then on VCE FRA DUB last April. Due to a storm in Ireland the plane (full 321) was diverted to MAN. A significant amount of the passengers were Russian transmitting through FRA.
I actually did DUB VCE via ZRH booking all flights through LH. The ticket was exactly half of that of EI or FR direct flights ex DUB.
Same story this year EI in peak season to many Italian airports double that of LH via FRA . LH is great product and often at an excellent price.