I don't buy the argument that he is a failed businessman.
Most people who run a casino or any business do nothing else. It appears that Trump owned or co-owned or was involved in some capacity in HUNDREDS of businesses. At one point, he also had a TV show. So it's not like he's devoting 100 hours a week to these businesses. So even if some of the businesses failed, it doesn't mean anything.
Also, note that people who use the argument that Trump is a failed businessman like you conveniently avoid giving credit to having Musk on his team, clearly one of the must successful businessmen in the world.
So this argument is silly.
Oh sorry, I forgot ... you put me on ignore.