Not really owning a business but as you've said having multiple jobs.
You can be employed with several employers as a freelancer and work with all of them with the same skill that you've got. But to be on this type of situation will require you vast experienes and confidence that you can deliver what the clients are asking you.
For skilled people, specially those that have in demand skills, they're the most desirable in the gig marketplace as they're like the performance/output based jobs.
Surely, skilled people will always have their advantage since they can be well compensated if their employers become satisfied with their performance.
And the employers don't have to spend time and money for trainings because they already know what the job will be. So, it both saves them time and it'll be easy for the new hiree to get onboard by being skilled and experienced.
But I believe even if you got multiple sources of income, as long as you cannot manage your finances well, and you keep on spending on unnecessary items, you will never be stable financially and worst is you may even drown from a debt.
I cannot argue with that because I also believe that financial literacy depends on people. Even if you're the most and highest paid employee but you are financial illiterate, you're going to have hard time in managing your finances and will still end up being unstable.
And someone who doesn't earn that much but are good in budgeting, he'll be able to win against that someone who earns a lot but don't know how to budget.
Because the thing here and reality is that, if you're earning more, your lifestyle is also improving so you have to sustain that.