Re: Dangerous?
Things like the helmets would not be legal for sale on the sites, because they don't carry the EU certification. This has always been a problem, long before Internet sales. The same helmet is available with or without the ECU mark. The one with is legal in Europe, the one without is a grey import and is illegal, because it doesn't contain the right certification. The problem is, the average copper on the street can't tell the difference between a certified Shoei or Arai and a fake, so he has to go by the certification mark (even if it is faked), so a US DOT approved one is illegal...
Anything electrical without a CE certification, for example. Products for children that have been tested and proven to contain toxic substances or metal spikes (last year in Germany several cuddly toys were removed from sale because they were either toxic, poorly manufactured (heads came off and babies could ingest the foam) or were stiffened with metal wires that could cause injury).
Clothing or upholstery that isn't fire retardent (and tested) to EU standards would be another area.
IoT dolls have also been removed, because they break EU privacy laws (know security weaknesses that allow hackers to listen in on the kids or speak directly to them). A kids watch was also removed out of privacy grounds, because parents could listen in on the kids when they were at school, this broke the pirvacy of other children and of the teachers. The parent would need to get the written permission of everybody the kid came in contact with, before they could evesdrop on the kid.