not exactly what you're asking, but banks and insurance companies are the majority of what I call "the beaurocracy of money". they don't produce anything of value, and are basically just a sinkhole for labour.
They abuse the technologies used by the stockmarket to buy and sell within milliseconds, so they can make a profit. They add absolutely nothing of value to the system, yet leech both money and talented employees from the market.
My apartment complex uses a package delivery service that basically acts as a middle man to receive your packages and deliver it to you. They use contractors who pick up packages from their warehouse and deliver them door-to-door. As expected, it's common for packages to get lost/stolen. Instead of getting your package on the date/time promised, you have to wait several more hours for it to actually arrive. If it gets to the warehouse late in the afternoon, you'll get it the next day. If you have Amazon next-day delivery, you essentially negate it with this service. If you're expecting perishable items, good luck getting it fresh. If your package is large or heavy, you'll have to wait several days as they only deliver oversized packages on specific days. All these are mandatory with a fee ranging from $10 to $30 on top of rent.
This is the real reason why companies are trying so desperately to camcel WFH. Covid revealed the truth (that we knew all along) that these people add no actual value to a company. They're only there to act as a buffer between the C-suite and the peasants.
Anybody working in SEO / "search engine optimisation." Complete bottomfeeding scumfuck grift. The only reason it's not considered fraud is because the government hasn't caught up to it yet.
They've largely subverted the occasionally useful profession of journalism. There's a big difference between researching things your audience wants to know, and asking someone with a commercial agenda what they'd like to tell your audience.
We could very easily vote on most issues ourselves using the wide array of technology at our fingertips, with a similar or possible better sense of security than what politicians currently provide.
But the only way for that to happen is for politicians to make it happen, and who would vote to eliminate their own job? No one.
Therapists used to be the most helpful thing in the world (or so I've heard), now they're so unhelpful they have to rely on the state to get us to use them and have so many different indie-based projects and programs competing with them, like BetterTherapy (which isn't bad tbh). The old joke is they're paid friends but now I see they're just paid, you could be in a genuine situation where something obliterates the quality of your life (e.g. custody battles) and they'll be like "does lithium sound good" (which by the way, lithium is outdated by two thousand years, so if it's recommended right away to you, run). The reason they're not set up like lawyers where you only pay them "if you win" is because they know this would destroy them.
Some local governments have rules that X must be done by someone in that area. Usually the mayor's nephew. To get around it they are made into a rep for the company that does the actual work. No value whatsoever to the project, the users, or the taxpayer.