You can tell it's legit if they charge you $2 extra for a credit card instead of a bank transfer lol

Most have gone that way, but a few were still letting you put your entire property tax on credit card with no fee whatsoever as recently as last year.

Woohoo free miles! Sometimes the fee is so low that even when they do charge it, it's worth using the credit card.

Yeah, I've encountered sites that charge a 1% fee for using a credit card, but I get 1.5% cash back.