but who can use this for some online business, I guess less then 1% ?
I suppose it depends what you sell.
If you sell in high risk niches such as sarms, peptides, nutra, kratom, pharma, casino, etc you can do good volume with just ecehcks and apps like cashapp, skrill, bank transfers, etc
Adding debit only cards is a cherry on top imo.
If youre selling normal things like clothing, dropshipping random goods, then no it likely wont work out as well. Most people do have a debit card however.
IPTV would be a good fit for debit only I think. Customers know they are buying something they shouldnt be, so they are more understanding of payment options. Youre better off losing half your sales volume and rebuilding it I imagine then having to find a new cc processor every other month though.
I am in the process of planning out and getting some merchant accounts. A few of them will only be echeck and APM, no cards at all, and I expect them to have good volume of 100k/month. Keep visa/mc totally out of the equation and kleep the accounts strong.