Just because I don't care for Elon (nor think he should have that much money), doesn't mean I don't care what he does with his money. If he buys and shreds the Mona Lisa, I care. If he pollutes LEO because a math error keeps the satellites from deorbiting and causes Kessler Syndrome, I care. If his Boring Company in Vegas has a disaster and a hundred people die in his tunnel, I care.
I care about a lot of other things he could do too, but I'm not going to list them.
Meanwhile, while I don't care for him, that doesn't mean I want him to become poor. I don't care if he has a megayacht or something.
That was the Falcon Heavy test launch and he wasn’t able to even give away the flight for free to anyone when he offered.
If he was really doing it "for the lulz" then there would be many more such launches. Cars, a painting of some artist that offended him, etc. We haven't seen that though.