In a more Realpolitik fashion: What the law says only actually matters if you have way more time and effort to spend on enforcement than is worth it for anything but the most expensive of purchases.
The marketplace selling prices are way below where it’s worth it to anyone to try to enforce any particular interpretation of any particular state law (much less the law of Delaware or North Carolina or wherever else EPIC might want to claim venue at odds with your chosen venue.)
Free refunds makes normal people more comfortable with buying, and thus drives up number of sales. This increase is usually bigger than the potential increase in refund abuse.
Also, refunds should be a non-issue – If I were credits $X during purchase, and the customer changes their mind, I should be debited $X, and this should happen before I actually see a payout, so it really doesn’t affect me as a seller one way or another.
This is all based on “good business practice” rather than any specific law, or even moral position.