There are certain sayings, phrases or slang that I may not be intimately familiar with.

This says nothing about your fluency. There are tonnes of English slang that Americans are unfamiliar with, and vice versa.
Hell, there’s a lot of Singaporean English that doesn’t exist in the minds of Brits and Americans, but Singaporeans are still fluent in English, it’s just different from what people consider “true” English.

Stop apologising, start acting

No mainstream alternative to Android/iOS exists. Same goes for Visa/Mastercard. All of them are US products.

Essentially shutting down all smartphones and most consumer payments would be pretty crippling.

I hope this whole thing is enough of a wake-up call for the EU to put (more) effort into a lasting solution.