Buyers in European countries enjoy the right to return goods within two weeks and get clear warranty information about the minimum 2-year warranty period, rules that platforms that host third-party sellers have sometimes found difficult to enforce.
Consumer rights groups in Belgium, France, Italy, Luxembourg, the Netherlands, Portugal and Spain asked their national regulators to look into practices on AliExpress, which mostly hosts Chinese sellers.
The Consumentenbond also noted that AliExpress' terms and conditions force consumers to go to arbitration in Hong Kong if they have any dispute, while EU laws give them the right to go to courts in their own country.
French consumer group UFC-Que Choisir meanwhile said that French clients were not being provided with documentation in French.
"We will look attentively at the complaint which we have received and we are ready to engage in discussions with the European Commission and competent authorities," the company told AFP.
"We respect the rights of consumers and we are very attentive to their concerns."
The complaints came a day after Alibaba's founder Jack Ma was in Paris for a tech conference, where he wryly suggested Europe should spend more time fixing problems than creating laws and rules.
"If you think the tech revolution is a problem, I am sorry to say that it has just started," said Ma.
"If you think it is an opportunity, it is only beginning. One thing changes: your mentality."
On Wednesday, Alibaba announced its net profit more than tripled to USD 3.8 billion in the first quarter.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)