I could be completely wrong but Chase does operate in the UK so once the contract changes Apple might then have the means to launch in the UK too at least.Seven years only in US!
And after that they might try to expand to Europe from there assuming chase continues to expand in other countries.
Also because we’re not in the EU anymore we Apple dont have as many hoops to jump through. At least not the ones that are in place for European countries.
Which is why Siri AI works in the UK but not in Europe (yet).
Basically what I’m saying is that the chase partnership might make expansion outside of the US more of a possibility in future?