Oddly I find the reverse. They apply random coupons only at the final checkout stage and I often end up paying only half for the items I'm buying, especially if I order many items.

I seem to get the 'delayed delivery' coupon every time even if the delivery is on time for example, and sometimes that coupon is worth more than the item itself for low value items.

I haven't made any purchase recently so maybe that's their way to subsidize the cost of various laws put in place in the EU recently (tax and shipping). But maybe it's also because you buy from the US?

It doesn't matter much anyway; I stopped buying there because I am a bit tired of too random quality that doesn't make the "savings" really worth it. For example, I bought a connected outlet that was half the price of ones from an EU brand but the app is pretty bad (data logging and display is terrible) and build quality worse. I also bought various RCA cable for an old amplifier and all of them were producing noise, I got a good one from Amazon (made in Germany) and no problem.