Tomorrow Youtube or Twitch could expand their offerings to include your business model and you may find yourself irrelevant within 6 months.
I had a liquidity event last year in which I had the opportunity to sell either none, a part, or all of a holding in a product I strongly believed in for $6 million. I cashed out $2 million, kept 2/3rds equity. Since then, despite my belief in the product, it has lost most of it's value. I am very relieved (as is my girlfriend!) that I took (some) money and ran.
When you are young you can feel a sense that success is inevitable and you want to keep doubling down, but there are a truckload of people in their late 30s and 40s and 50s for whom things just never quite worked out who would give anything for the security that a couple of million dollars provides.