Penny auction apps like dealdash, they always have bots that will outbid you so you can never actually win one of their auctions. If you do win an auction, you're not actually guaranteed to ever the see the product you won.

College. The learning is fine, the cost is freaking out of hand. I never went and have no regrets. My daughter is going now and I feel like I'm supporting a scam.

Everything comes with a subscription

Paying for airplane luggage

The extra .9 cent we pay for every gallon of gas in the USA.

Car rental - I'm 95% sure I don't need any of those extra insurances but due to pressure and fear tactics (you do want to be covered if x happens, right?), it's hard to know in the moment.

Adobe

Real estate agents

Paying high subscription fees for Autodesk products

Companies being the sole arbiters of OTA "Upgrades" and DRM "purchases".

Copyright

Speculative economic instruments. There's a reason why specific items, such as onions in the US, have been banned from being essentially bet on.

Mass Surveillance.

Companies and governments alike have successfully convinced most people that they have "nothing to fear".

Resort fees, especially in Las Vegas.

Organized religion.

Nothing comes even remotely close.

Fashion

most cheap things that fall apart after a short time

Printers and printer ink

Patents

Airline ticket prices.

gacha game, paying premium money, an insane amount event just to see virtual character