Even if the customer withdraws the request, it still counts and you still have to pay the fee.
I'm sure eBay has better terms with looser thresholds, but even they are not impervious to the dispute system. At some point the networks can say "nah, we'd rather not deal with you" and there isn't much eBay could do about it.
Stripe's docs, for instance, mention this:
> Once a cardholder initiates a dispute, it is no longer possible to avoid the fee.
https://support.stripe.com/questions/dispute-fees-faq
Additionally, according to Stripe at least, these disputes will remain on your "record" with the particular network:
> All disputes, whether they’re won or lost, count towards your dispute rate, so the best strategy to avoid monitoring programs is dispute prevention.
https://stripe.com/docs/disputes/measuring
Even if the customer withdraws the request, it still counts and you still have to pay the fee.
I'm sure eBay has better terms with looser thresholds, but even they are not impervious to the dispute system. At some point the networks can say "nah, we'd rather not deal with you" and there isn't much eBay could do about it.