Concerned about USB switch current backflow

[Gomdolyi]

I am looking to buy USB switch like below two switch my keyboard and mouse between my work computer and person computer.
https://www.amazon.com/UGREEN-Selector-Computers-Peripheral-Switcher/dp/B01N6GD9JO?ref_=ast_sto_dp
 

However, reading from internet posts and customer reviews, current backflow can cause serious damages to USB port or even motherboard. Most of these USB switches doesn't mention anything about backflow protection. Is the current backflow legitimate danger to computer's usb port/motherboard? Or is it one of those issues where people are overreacting? 

[Kilrah]

It could be an issue, but switches are obviously meant to handle that right.

[Poinkachu]

5 minutes ago, Gomdolyi said:

I am looking to buy USB switch like below two switch my keyboard and mouse between my work computer and person computer.
https://www.amazon.com/UGREEN-Selector-Computers-Peripheral-Switcher/dp/B01N6GD9JO?ref_=ast_sto_dp
 

However, reading from internet posts and customer reviews, current backflow can cause serious damages to USB port or even motherboard. Most of these USB switches doesn't mention anything about backflow protection. Is the current backflow legitimate danger to computer's usb port/motherboard? Or is it one of those issues where people are overreacting? 

Using KVM for years. I don't think I ever had a problem caused by such thing.

Even with cheap arse KVM switch that still have VGA port on it.

[johnno23]

I use the exact same model for years just an older revisie and switch between my gaming PC rig and the Mac for my 3D work. never had an issue.

[JuneOn Tech]

Yes, it will be a big issue if you use the connected external USB hub (even the USB hub has it own power supply) ports for charging power-hungry devices or the external USB ports have more than 4+ ports on it.