Easy for who? And for what purpose?
Implementing an HTML tag that will attempt to charge you money is wrong on so many levels.
If I walk into a store (click on a link), even though I know there's stuff to buy there, the store (website) doesn't have the right to charge me just for walking into the store (hitting the landing page) -- unless they clearly let me know that (perhaps a big sign on the door?) before I enter the store.
And as for what you would or wouldn't do, that's great! You're a stand up guy[0].
Sadly, there are way too many people who would abuse this in a hot minute. Especially since many folks wouldn't even find out about it until they get some sort of transaction notification (with a credit/debit card, that could be weeks).
[0] N.B.: That's not snark or sarcasm. It's good to know that there are still other people who will do the right thing because it's the right thing to do. Thank you.