Accepting cards from US-controlled schemes is not an issue at all. The geopolitical issue is not having any alternative, and these US schemes being the only way to pay even in domestic transactions.

Almost nobody considered this a problem until a few years ago, but the relevant EU stakeholders got pretty rattled recently [1], and my prediction is that this particular bell can't be un-rung.

[1] https://www.theguardian.com/law/2026/feb/18/international-cr...