Is it still possible to buy disposable debit cards for cash?

https://www.swirlcard.com/

There is a difference between restricted use anonymous cards like the One4All, gift cards or even the restricted paysafe card which cannot be used online for more than 50€ and the universal use once on mastercards/visa networks like swirlcard or paysafe mastercard.

But all of these are very fee heavy, I mean just look at Swirlcards https://www.swirlcard.com/costs.php or even paysafe https://www.paysafecard.com/en/paysafecard-mastercardr-1/?country=ie

You are paying heavy for loading in cash and then also for usage.

Plus, if they think there is something suspicious going on, they are required to ask you for a full identification beyond just mobile number/name.

Don't go down that route because in the end you pay heavy.