Earlier quoted context omitted.
Given that 3DSecure is required for all European cards we should have been seeing lower fees since that requirement. Instead fees are going up.
Also, as far as I can understand https://stripe.com/docs/disputes/how-disputes-work , Stripe doesn't actually do anything manual in the process, it's all handled by the users bank or automatically by Stripe (notifications, taking fees and so on). So how it got more expensive for Stripe?
Managing disputes is also a costly and manual process for our users. So we’ve invested heavily in ways to help mitigate disputes from occurring in the first place with Stripe Radar (incl. by default), or by using Chargeback Protection (where we cover the disputed amount and waive any fees without needing to submit any evidence).