This is highly country dependent. Anonymous prepaid cards aren't as widely available as you might think, and often they have very high user-paid fees.

Which reloadable debit cards have no KYC requirements?

The amount of money you can load or receive into a debit card is limited without doing enough KYC overhead you could have gotten a bank account with the same effort.

If you try automating bots to do KYC for debit cards what you'll be doing is basically looking like a money launderer and get all your accounts shut down.