Gianluca The bunq cards generally respect the country-specific contactless limits. Not sure if they still use the £45 limit or already £100 per day, though. In any case you should be able to use the tube just fine with both the plastic card and also via Apple Pay if configured correctly as Transit Express card.
For these kinds of country-related questions it's always a good idea to look into the respective official country thread. See here for the UK: https://together.bunq.com/d/18721 (You can find these threads by going to the Friends tab in your bunq app, and then tapping on the "Countries" circle on the right) It seems like several people there confirmed that their cards worked fine.