As per that link Callum posted (IIRC) it’s all about the actual time of flight. If there was an anticipation of reward to be gained from the flight, you MUST PfCO.
Totally unexpected/unpredictable reward for something that was (at that time) totally for fun as a hobbyist can be sold … if someone approaches you to buy.
Very grey areas come into effect when people earn anything from the likes of blogging and YouTube … with associated “advertising”, etc … the “are you anticipating posting/earning” becomes difficult to disprove, etc.
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