It really is ^
It's like alibaba where you buy in bulk (then resell on Amazon and eBay in UK) but you buy individual items. Expect 2 weeks for delivery and not quality items.
I usually use for party decorations, party favours, silly school dress up days, nothing else really.
Definitely wouldn't trust electronics etc from there as not regulated like in UK / EU.
As to the data mining stuff I always use apple pay to encrypt the payment details and private relay for signing in so that email etc is also hidden.