All proxies ARE NOT created equal... consequently, it depends on the proxy provider. Regrettably there are a batch of proxy providers that are actually resellers of: (a). f-r-e-e proxies (b). resellers of private proxies, and (c). resellers of harvested/scraped proxies. These dudes tend to make a killing for a while.
The best option in your case would be to use a P provider that specializes in YT proxies. This would be no different than using a proxy provider that specializes in XR, SB or TA proxies.