So no, they didn't "bought Trump the election".

And the fact that a 3rd party supports an opponent does not kill any politician's career. Biden retired by himself, following his own party's pressure. And Harris is still around, I believe.

It seems like you have an unfalsifiable belief. If one side raises more money and wins, it because of the money. If one side raises more money and loses, it is still the money because the other side spend it more effectively.