Underwriter's Laboratories (UL) is a testing lab who also writes the standards for what is allowed in the US market and those who rely on UL's standard making. UL or competitor labs such as CSA, ETL etc. will not give their mark of quality to products which are not safe.
Of course for business and treaty reasons, direct mail (including via Amazon dropshop warehouses) bypasses that safety regime, and you can get all manner of junk from certain Asian nations. Moral of the story: Don't buy electrical gear on Amazon lol.
If the item has a UL Listing or other NRTL, then they know about it and it's been approved anyway. CE and CCC are not NRTLs.