For example, my first week at Google/YouTube, I was in a New Hire meeting with our VP. Someone asked about profitability, and he responded that Larry said we didn't have to worry about revenue yet, since the main goal was user growth/happiness, and revenue could come later. Which I thought was fascinating, considering how big YouTube already was at the time (in 2013)!
Though I think this changed a year later, and I find YouTube ads a poor experience compared to Instagram and TikTok -- which aren't merely "better than the rest", but stuff I actually enjoy watching.