That is a correct definition. It is widely used by chuggers themselves.
Exactly. They used to drive me mad when I worked in central Brighton. At one point there were about 15 of them from NSPCC dotted along North Street. I actually emailed the council, and they said they have no real power over how many of them are allowed or where they can stand. If they are collecting cash they have to follow strict rules, but not if they're just taking your details to extract 2 quid a month out for the rest of your life.