Not sure how much use it would be for Tallinn anyway, you have Wifi in your pocket anyway so that really isn't a deciding factor usually (unless you are traveling through and don't want to get a temp SIM for mobile internet).

If I'd have to guess, people pick cafes to work from here based on the location, atmosphere and food.

Could literally work under a tree in a forest here if you have enough battery.

I think it defaults to Amsterdam for anyone it cannot locate (because "A" maybe...?).

Because no-one has added a closer cafe yet.