Nope. Google+ was a ghost town. They made the right call to shut it down and focus their efforts on YouTube.
The videos and comments on YT are superb training data, every bit as good as Google+ was.
In 2025, YouTube’s total revenue (advertising + subscriptions like YouTube Premium and TV) surpassed $60 billion. If they spun out YT it would have a market cap $500-600bn putting it in the top 20 companies. Google+ would never have been worth much as the 7th most popular social network.