With a business, while you deal with some similar issues (compartmentalization, context-switching), I expect they'd feel far less invalidating (again, to me/those with similar personality types) because you'd know you were actually applying yourself to do the best you could.
Hell, with all the crypto madness going on right now, you could probably get ludicrously wealthy just doing freelance black hat security testing.
You aspiring fraudsters should actually read all the paperwork they put in front of you next time you start a job, and tell me if there's no exclusivity at all in it. Just because Jack Dorsey got away with running two companies doesn't mean it's right or just for you to weasel along and lie to two managers forever.
Get your life together and do something meaningful instead of stressing yourself out for the sake of whatever pair of pittances you can earn from this dumb scam.
Another good one is Daedtech/Hit Subscribe
1. Find a (ideally large) group of people you care about
2. Find a problem they have
3. Solve it
EDIT: Pretty rich that I'm getting downvoted so much, despite multiple examples of successful SaaS creators showing up in the comments, and this being a forum started by a VC partly to promote and encourage tech startups. If you think that starting a tech business is so impossibly difficult that you're personally offended at the idea of someone recommending you do it, I'd say you should just go back to Reddit or Twitter.
If you're bristling at me calling SaaS "easy", I just meant it's easier than running a multi-year scam and probably committing fraud, depending on the details of your employment contracts.