However, in my opinion, the point is that nobody should work at such "shitty jobs", who enjoy being a waiter, will be one in some high end restaurant where he will compensate in an extremely honest way.
The introduction of basic income will need a complete mental switch.
We can dream about robot that serve us, or we can start to realize that the quicker way would be to change mentality and stop to need somebody (or something) that serve us.
But we're not there yet, our economy is still reliant upon a large number of people doing "shitty jobs" in order to grow in general, and more specifically to continue this push towards further automation. This is the challenge: you need a way to alleviate human suffering during the transition towards a greater world for everyone, but the most obvious way to do that (basic income) may halt the transition itself. What we probably need is something that looks more like a bridge than a final destination, but any such bridge starts to resemble the experiments in communism that cost the world so much during the 20th century.
You know those bars you go to? Restaurants? Theatres? The list goes on. No one would work at those shitty jobs any more. Because 25k is comfortable - why would I work at a shitty job for another few thousand?