Ultracycling

On a more serious note, the point is where you draw the line. Where you draw the line is to an extent arbitrary. But the whole point about drawing the line is that once it's there, you either stick to it, or you don't take part, or you cheat. If you don't want to comply with a no-drafting rule, then there are lots of races where drafting is allowed. Do one of them instead. If you sign up to an event with a set of rules, which you know about beforehand, I don't think it's too much to expect people to stick to them. If you think the rules are silly, don't do the event.