I've been to the Norfolk Broads many years and hired boats.
1, no way on earth will any YouTube video stop people hiring boats. place is busier than ever .
2, all publicity is good publicity
3, YouTubers I know have gained followers from boaters like myself. And great for when you are away from the broads , I've actually booked sooner and again because I watch them start videos earlier in the year.
4, someone is always gonna watch you make a mistake on a boat .. Tip . Keep going and get good at it !