Subject: Re: Safer to diversify?
their UK division handles non-US accounts for the majority of countries that don't have a local IB division
...
Actually they moved all European accounts to Ireland after Brexit.

Not so.
My account contract remains with Interactive Brokers (U.K.) Ltd., Level 20 Heron Tower, 110 Bishopsgate, London.

IB Luxembourg wound down and spread the clients among different entities:
IB Ireland serves a subset of western European EU countries.
IB Central Europe Zrt (zártkörűen működő részvénytársaság, Hungary) handles most people in central Europe.
IB UK handles residents of various countries outside EU/EEA. UK and Switzerland are probably the biggest, but wee Monaco is another.
I can't find the data, but I think (?) IB UK still handles several non-European countries as well.
Of course, for practical purposes those are all just corporate "fronts" to the same back end.

Jim