Since I often have to deal with post and customs in my job, here is an explanation:
There is an EU law according to which all consignments of goods that are imported into the EU from outside the EU have to pay customs duty and taxes. This regulation has been in force since 2021. There was a transitional period until 30 June 2021. From 1 July, this regulation must be implemented in every EU country.
There is still an exemption for private gift consignments. Here there is still an allowance. But: Gift shipments are only possible between private individuals. As soon as a legal person (company) sends goods, these may not be sent as a gift (even if it is a member gift, as in our case). Our membership “gift” may therefore not be sent as a gift, but must be sent as a consignment of goods with a CN22 form and a (realistic) declaration of value. By the way, this gift-regulation was already in place before 2021. U2.com's practice of sending items as gifts with a value of 0.00 was never permitted, but was often accepted by the local customs (but in some cases people had to pay customs).
How much you have to pay for the CD depends on the value, the customs duty and the import sales tax of your country. Basically, the amount is not too high for a goods value of 10 USD (5+5). What does get expensive, however, is that the postal companies charge a service fee for presentation to customs. In Germany, for example, this is € 6, in Belgium € 15, which is then added on.
If you live in the EU and didn't have to pay anything, you were lucky that your shipment slipped through without customs clearance. But that could be different next year ...
By the way, you will face the same problem in the future if you order things from the U2 fanshop and they are sent from the US or UK. The UK is no longer in the EU and these shipments will now have to pay customs duty too!
The problem can really only be solved in one way: Namely, that a band from Ireland (EU) also sends its items from the EU. At least the shipments that are also sent to the EU. It should not be a problem to send items from a location in the EU (Ireland, Netherlands ...). If U2 is so committed to the EU on the last tour, but then, when it comes to business, the EU is ignored, one has to be very critical.
A complaint to the customer service will not bring you a solution for this year. You have to pay the fees or refuse & return the shipment. However, I would recommend anyone who has had to pay to contact the customer service anyway. This way (or through social media) you can put pressure on them to reconsider their shipping. If they send items destined for Europe from Europe, the postage will also be cheaper. However, this requires a shipping address in the EU. It would not be permissible to simply bring items with a US sender to Europe and then send them from there. In principle, items must be sent from the country that is also indicated as the sender's address.