Most people didn't notice this until G+ hit the net, and some kids used their gmail account (set up with parental knowledge and support) got closed because G+ found out they were under 13.
Others have discovered that if their app on Google Play gets into trouble, bye bye gmail etc.
It is a downright hamfisted system, and likely an outcome of Google's drive to automate all the tings...
You know a company is mismanaging things when they're doing things that are against their own interests.
Can't you just make another account for videos?
It’s an extreme example, but if that account is true, google definitely have automated tooling to link distinct accounts.
I can’t actually imagine any reason why they wouldn’t. It feels like something they’d need at their scale.
Sure, in some ways, the fusion is very convenient.
But I've read a few too many credible stories about how a loyal Google customer does some innocuous action that happens to set off one of Google's triggers, and is instantly banned from the entire ecosystem.
Google's complete lack of customer support, and indeed hostility to the concept of ever being reachable by or accountable to a user just makes it worse.
Bottome line; Google is ok for casual use, but as a biz, I'll never touch them, and advise others to avoid like the plague.
Google's drive... Had to read that twice, for a moment I got really confused about my cloud storage subscription!