It's not about that. I'm the CEO. I'm sure it's somewhat my mistake because they wouldn't risk lawsuits for shady tactics. Probably a 0.8px text in gray somewhere on that page saying I'll get charged yearly and not monthly.
This sounds like you don't do business often (with US corporations?) They're hoping more people like you just let it ride. That's how they're making money.
Hit them where it hurts - have the bank perform a chargeback. Enough of that happens, and their rates to accept credit cards goes up.
I don't think one chargeback changes anything, but if people are more aware (not just in case of LinkedIn, but in general), this could make this shady business strategy less profitable.