The people taking part in this are talentless privileged idiots who represent everything that is wrong with the world
I don't know about talentless, inasmuch as some quite talented drivers and actors have taken part, but it is a bit Monaco and superyachts; "Lifestyles of the Fabulously Rich and Famous", if you will. The charitable aspect isn't trivial in absolute terms - £500k raised last year - but is a little at odds with the participants' resources were it pure philanthropy.
The rich man's Cannonball Run...
If I may be pedantic, participants in the Cannonball were timed overall, so the event was to all intents and purposes a race, albeit a somewhat lighthearted one, but still with a notional winner. The fastest time was usually a combination of good navigation, good (high) average speed and not getting caught speeding. The current Cannonball Run Challenge is very definitely about not getting caught speeding: thermal imaging, laser speed camera jammers, police radio scanners, and anything else that might help.
The Gumball 3000 isn't a race, and there is no timing element beyond getting to each night's accommodation in time to dress for dinner. The Gumball Rally (the film) was a race though, with no rules at all, and it was loosely based on the real world Cannonball events. Likewise, the Cannonball Run films were a fiction but embodied the spirit of the original event, which only ran for eight years in the 1970s.