Some Chinese companies, such as VEVOR, sell their product through European deposits. This means that the taxes have already been paid in the EU.
As for the quality of the servos, in my opinion it is good but by no means comparable in quality to a good name brand European or American product. But as I searched I couldn't find a European servo motor manufacturer with reasonable prices for my pocket.
Those who sell, that is, the sewing machine sellers, follow the same process as me. That is, they find a Chinese product, of dubious quality but cheap and sell it to customers at a low price with the guarantee of the store and not of the manufacturing company.
I'm a hobbyist looking to find an inexpensive motor to play with and have fun with. If I were a professional I would have to allocate thousands of euros to meet my needs in a reliable product.