I follow a YouTuber who often says "It's all about the fans" which means, everything he does is in service to his followers/fans... And I make fun of him because his accent makes it sound like "It's all about the funds" (money) and I know the donations are a big thing for him

Yes, "It's all about..." is commonly used in daily conversation to emphasize the importance or focus of something. Here are some examples: 1. "It's all about balance in life." 2. "When it comes to cooking, it's all about the ingredients." 3. "In this job, it's all about teamwork." 4. "It's all about staying positive, no matter what." It’s a versatile phrase that can fit many contexts!

It's used pretty often. It's not slang, but it IS informal. It's one of those phrases that suddenly became popular a couple of decades ago and will probably fade in a couple of decades. "It's all about X" means that X is so important, it's almost the only thing that matters. In a clothing store, my wife was with me. The salesperson was showing me chinos and corduroy pants. I said I wanted corduroy, a very comfortable fabric. The salesperson said to my wife, "it's all about comfort with him, isn't it?" Meaning that I cared entirely about comfort and not at all about style. In a news story, Texas cattle ranchers told reporters that in the extreme heat, "it's all about the hay." They meant that a good supply of hay was extremely important to the survival of the herd. "Why do you keep going to that steak house? It's crowded, it's noisy, and it's expensive." "It's all about the steak." That means steaks are so good they are more important than the atmosphere.

Yes it is often used. It’s all about balance 😉