They had been capped to 0.3% for credit cards and 0.2% for debit cards by EU law,but now we have left they have decided to increase fees to between 1.15~1.5% because they can:
https://www.bbc.co.uk/news/business-55796426
https://www.theguardian.com/money/20...to-uk-shoppers
The issue is that the European operations of some major US companies such as Amazon and Paypal,are located in Luxemborg,so this has the potential to affect even purchases made in the UK if companies pass the costs on. The UK is one of the bigger purchasers online of goods worldwide. I hope the government steps and tells them to go and do one. Visa,currently haven't said anything - so if they do intend to not increase their fees,I would vote with your pocket and move away from Mastercard.
Edit!!
Also Ayden(the new provider Ebay is using) is Dutch. I wonder if this affects Apple and Google online payments too?