The problem is not IB. The problem is the European regulators. They are trying to make it hard for European retail customers to trade American-produced ETF products. Supposedly this protects European consumers. (Do you feel protected?)
This restriction also has a secondary benefit (surely unintended by European regulators): it will drive European consumers to use European-produced ETFs, not American financial products.
You can read more about this here:
In this case, I would not be quick to blame Interactive Brokers on this. The European regulators are ultimately responsible. The same problem will ultimately apply to any broker operating under European financial regulations.
P.S. If you are an American reading this, it does not apply to you. You are allowed to trade any ETF product you want. For now.