I went to the place in Utrecht that uses PaySafeCash (Wittevrouwenstraat 8, 3512 CT Utrecht), but they charge an additional €4.50 convenience fee for the first €100 and then 4.5% for every euro over 100. This is allowed by PaySafeCash and when I asked Bunq support they confirmed it is allowed.
What a total ripoff. That means if you need to deposit €1000 you will pay to Bunq (1000-100)2.5% = €22.50 and then pay to the PaySafeCash operator 10004.5% = €45, for a total of €67.50.
ABN Amro, ING and Rabo would charge 1000*0.5% = €5 for the same amount.
The fact that Bunq don't mention any possibility of convenience fees in their blog post on the fee structure just rubs salt in the wound.