To put a finer point on that, it’s important to remember not all startups succeed. We never hear the TechCrunch stories about the startup that quietly shuts down, or was sold to make the investors whole, leaving founders and employees holding the bag.
Reality is starting your own startup is a very risky proposition. Huge upside potential (serious generational wealth), but tons of downside scenarios. If financial security is important to you, then pursuing a more measured approach to reaching some basic level of financial independence is probably a good idea before going that route - I write a lot about this here: https://ramenretirement.com/
On the other hand, starting or joining a startup can be a huge accelerator to career and skills growth. You’ll get opportunities you’d have to wait years for at a larger company. That’s (arguably) the best reason to join someone else’s startup.