Many people have had multiple gmail accounts since 2004.
I have a gmail account used solely for google store and Android TV related verifications that's unlike other business, personal, registration, or spam email accounts.
The TV's in the house, smart wifi devices, and guest wifi accounts are on separate subnets, the NAS hosted media has limited read only keyhole access accounts for TV apps to use.
Whether it's SmartTube or any other app (iView, SBSOnline, Netflix, etc) it's wise to assume that anyone can be comprised by malware to sniff traffic for (say) bank account passwords, host bots for DDOS or mining, etc.
You risk losing your entire Google account along with all documents, photos, mail, and whatever else you have there. Enough stories of this happening if you look around.
If you're just a normal user the risk is very low. This almost always happens when someone using Google APIs for business purposes trips a fraud or spam detector.
> Also are you really using same account for gmail, your personal pictures/docs and youtube?
Most people use "sign in with Google" and tie their Google account to services well beyond the Google ecosystem, just to avoid creating a new entry in their password manager (lol). You think people are making new Google accounts for each Google service? That's hard for me to believe.