In this world, money is power, and power absolutely does corrupt people.
I’ve seen a lot a fair amount of people that started off with humble beginnings, got really popular, made a ton of money, and turned into shitbags as a result because they can just fork up a bunch of cash to make problems go away.
Money and power enables you to get away with immoral stuff, if not straight up illegal.
I’d at least get a plumber to check it out. You could snake it yourself probably but you could also make it worse. If the pipe’s broken, you might as well just get more debris falling into it and clogging it further.
A regular plumber visit/check usually isn’t that expensive. Not cheap but far from 20k expensive.
It could also be connected to your flooding too, so you probably actually want to at least evaluate the damage ASAP. If the pipe’s broken, you just have a convenient pipe to drain all the rain water straight to your basement.