I don’t have any insider info, but it seems like they had to outsource deposit/withdrawal functionality to a third-party due to regulations, and it seems like that third-party happens to not support Lightning. I don’t know if the lack of support is for regulatory reasons or just not a business priority.
Discussion
Ok, so in Germany it's not a third party using Kraken systems as a whitelabel, but a completely different system?
Horrible news