I don't know what you are talking about :-)
If you know exactly what you want and can find that from sellers on Aliexpress who actually know what they are selling,
and put that in clear english language on there, everything is fine. If there is any vagueness, which is not resolvable by
messaging/mail/chat, then I don't order.
When I ordered with the above conditions met, I never had any trouble. Also fast delivery by air to *.de.
edit: That was for electronic parts, boards, development kits, measuring equipment, and some tools so far.
Don't know about the other stuff on offer there, but I'd guess it would be the same.
The problem is the knowing and the sometimes horribly translated descriptions there,
which make it look like alien gibberish.
Apart from that I'm thinking it's mostly the same stuff, not even 'bootlegged', just directly from the source/ODM/OEM,
while the usual 'high-quality' stuff just has a different label on it, and it is the greed for that label/brand which enables
countless middlemen/upsellers/marketeers and their shady schemes.