Glenn Fleishman:

Recent protectionist changes by the European Union further
effectively exclude U.S. small businesses like mine from selling
to EU customers. It’s a little complicated, but it has to do with
how tax and customs fees are collected and extracted from
low-value packages. This is not a tariff issue, unbelievably, but
one about reducing competition.

The summary:

Delivering items under €150 per shipment into the EU now costs at
least €3 per package, and may require hiring a specialty firm to
manage time-of-purchase tax collection and payment because of the
many differences in filing by EU nation. Shipping prices have
swelled. No shipper currently offers rates close to affordable for
modestly priced items, like books, while properly collecting the
€3+ customs fee.

If these new rules were prompted by Chinese companies like Temu taking advantage of de minimis shipping exceptions (basically by shipping zillions of cheap items one at a time, rather than in bulk), the new rules ought to apply only for items arriving from China.