> But there are no chargebacks here, since we don’t take a card upfront and we don’t bill in a hidden way. In the worst case, if you missed or didn’t read that detail, you can simply decline and not subscribe after the trial.

This is a dark pattern. You should display the actual minimum monthly charge in text that is at least as large as the price per user.

No, the worst case is the customer gets the $10 price into their head and then doesn't see the actual monthly charge amount when they subscribe. You are now charging the customer 5x what they expected to pay.