Earlier quoted context omitted.
If clearing customs per-package is too expensive or inconvenient, I expect Aliexpress will tweak their managed logistics process to import items as bulk shipments in the cargo container at wholesale value and add estimated customs charges as a checkout fee on top of item prices. I don't think big print "free shipping" will be affected as it gets people to buy more often and it pads the margins when people buy more at…
They already do bulk imports, and they have have been doing it for years. With their "Standard Choice" shipping, for me where I am, that means that my stuff is sent from New York to me in Ohio with USPS. There's no customs forms attached when it comes my way, nor should there be: I didn't import anything. How it gets from wherever it started to New York is not my problem -- just as it isn't my problem with the other…
Since what you say would imply that if I order something from Aliexpress right now (so it wouldn't clear customs until May 4th or so), that my package wouldn't get tariff-impounded but Aliexpress would just eat the increased tariff cost - how sure are you about this? The last Standard Choice packages I received I didn't really pay attention to if they had customs forms, and don't really know the rules around that anyway (ie could there just be an electronic customs form and not a physical one attached to the package)