About the expectations, the good thing is they change fast. France had the same path, where tipping was strongly expected in cafes. In particular, as it was smallish amounts, people usually paid cash (or the cafe would just refuse credit cards below some fair amount) and it was easier to leave something on the table.

In a few years contactless became widely available, laws on obligation to take payments also became pervasive, and people paying a 2E coffee by card is not unusual anymore.

Numbers of tips have crashed [0] and the cafe owners are coming to terms with it. Anecdotaly amost places I saw baked the tip into final ticket as a “service fee”.

I think the same kind of mechanics will come at play most places. Why ask the customer for some random amount on a screen when everyone will be less awkward to just have it as a fixed line item in the receipt ?

[0] https://www.lemonde.fr/m-actu/article/2017/08/30/et-le-pourb...