[afavour]

This is simply the mindset of discount airlines. If your battery is dead when you arrive at check-in that's too bad for you. It's in the terms and conditions.

If the server is flaky then boarding will be delayed for everyone and it'll be a whole crapshow but if their overall cost is lower than it would have been with printed boarding passes, fine.

[lxgr]

Usually they'll happily help you out with a "late boarding pass printing fee" on the order of a hundred €/$, though.

If this really is a total refusal to do even that, I'd be slightly surprised, but I'm sure their business developers have done the analysis and it makes some sense to them.

[Muromec]

I’m surprised they can get away with it in the EU. T&C or not, you paid for a fare and they know you did