The main issue that makes using UAVs of any sort difficult in Europe is the wide variety in regulation (ranging from de facto outlawing non Government use outside of playing to fairly reasonable), the European Aviation Safety Agency (EASA) is undertaking an effort to produce harmonized rules https://www.easa.europa.eu/newsroom-and-events/press-releases/easa-publishes-proposal-operate-small-drones-europe that might help a bit as essentially all European states tend to adopt them.
Naturally in the end it depends on how much the states are allowed to determine on their own (in particular exclusion zones) so I wouldn't get hopes too high. Simon PS: while fixed wing UAVs would in principle be better suited, from a pure practical and bang for the buck pov I doubt that the current hi-endish consumer grade quadcopters can be bested for what you would typically want to do for OSM.
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