Heh, I was referring to separate things and connected them in a tin-foil-hat way: the quite recent campaign against paper cups which encourages people to buy re-usable travel mugs and my experience with various chains serving paper cups even when sitting in (possibly fazing out normal cups). As in we're being guilted in to not accepting paper cups and instead bringing re-usable mugs.

Ah. Yes, paper cups for sit-down visitors is annoying.

Here in Germany some places even give out reusable cups with deposit for to go (as an alternative to paper if you forgot your own travel mug)