From
DHLs press release they did their tests with a VTOL drone with a swivel wing design, straight flight was basically the same as a fixed wing one.
Doesn't look exactly small either. However, i do not think that commercial operators are the main danger as they want to continue using them, it is private users that simply do not know about anything and just want to try to get cool videos or pictures with their new toy. And some of those toys can be quite heavy too.