Don't the twins specifically mention how much they get in trouble when saying how they got the Map?
>They slip Dudley Ton-Tongue Toffees - he could have died, but again no consequences.
Since when do TTTs kill people? As I recall, their dad was pissed.
>They win their bet with Bagman...but never face consequences
They also don't get the money.
>And then Harry hands them a pile of cash, because there are no more worthy causes.
Harry was sick of the money. He had watched Cedric die, and Voldemort come back, and Barty Jr. worse than die to get that money. He was a 14 year old, and he was sick of it. He has more than enough money, and the Weasleys are chronically low on cash; the twins might never have started their business without it.
>They also drop out of school without qualifications - unlike in real life, where this would lead to months of them sitting about in the Burrow doing nothing, they instead become master businessmen.
People have become millionaires with GEDs; Kanye West springs to mind. It's rare, but not unlikely. The twins were personable, talented, and smart.
>stuff that is obviously dangerous if exploited
Like just about everything else in the Wizarding World, yes. Wizards can heal most things, and tend to have longer lifespans and less concern with danger than Muggles. Someone got a concussion at the Quidditch World Cup and nobody rushed him off the field, IIRC.
>this would actually force George to undergo some sort of reflection or growth as a character
Because people whose extremely close twin brothers are killed don't ever undergo any sort of self reflection.
I like how they think Fred should've died randomly because character development.