Recently, Youtube users connecting through ExpressVPN are being prohibited from commenting when connecting through busy VPN servers.
Using Google's Captcha scheme would eliminate this problem.
Although Google itself uses Captcha algorithms on overloaded VPN servers, it does not do so on YouTube - which is one of its sub-divisions.
A user may comment on YouTube, if their VPN App is disabled. But if they use their VPN app, comments are ignored and the viewer receives the message "Comment failed to post".
Google/YT will attempt to explain this away as something other than another invasion of our privacy.
ExpressVPN Development Teams have been notified regarding this problem.