The IC / microcontroller in your VGA adapter couldn't simultaneously convert the signal from USB to VGA (display) and providing a USB hub.
There is plenty of reason for that part :
The signal of USB data and VGA signal is different you can only choose either one of them.
The USB port only for the external device when the VGA is OFF, meaning the ...
There is no USB-C splitter come out this year because there is not single produced chipset for USB-C Splitter/Hub.
And if your laptop using USB-C for charging input there, the data pin is locked automatically because it was for reading voltage and making it to lock the pin for setting data input or voltage input in charging mode.
Explanation in USB-C pin:
Using the USB port on TV is OK
It is never been dangerous enough although some reason such as:
Electrical shock (many TV use two-pole plug without ground).
The power only 0.5A only better TV use a 1A port.
This port is not for charging :)
The dangerous warning sticking the amazon fire stick to a USB port because people thinking it ...
You want a disk that will hold data for centuries?
OK, let me introduce M-DISC
Unlike other disks, M-DISC data can actually survive up to 1000 years. It looks almost the same as normal CD but it's more glossy.