Taking a step back: what's the difference between a service area on a road that is tagged with highway=services and one that is tagged amenity=fuel (with the corresponding additional tagging for food, ATM, ... ? Is the difference only the number of carriageways? single carriageway > amenity=fuel; dual carriageway > highway=services? And let's look at this: https://witoor.com/bicigrill/ (not yet on the map) This is on a long-distance foot-cycle route: it has a service station to repair your bike, same spare parts, it has seating area (to eat your own food), a restaurant, toilets, maybe showers (I don't know). It may have a charging facility for e-bikes (don't know), a facility that I am sure, will be more widespread in the future. This place is to all effects highway=services for bicycles (and hikers). Yes, there are most likely also equivalent facilities for boats. And I am sure that there are places for several categories at the same time.
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