Serious question: why aren't so many startups hiring processes filtering out a candidate who is scamming/working multiple jobs?
Just imagine being one of the people who legit joins a startup, is passionate, working long hours, earning your vest, to have your coworker pretending to be working.
If you really can work multiple jobs, just go freelance. Offer some consulting or whatever. You will earn more and have less stress than juggling multiple jobs.
You won't earn more. I've considered that at one point and most adverts on freelance sites like Upwork are written by people who are either clueless or downright insane. These people usually want you to create a completely new system from scratch using technologies of their choosing and the offers are like $8-$15 per hour or $800 for work that is supposed to take months to complete. Why would anyone want to agree to do that when apparently getting steady paychecks from multiple companies is an option?
Also the quality of the work is bottom of the barrel.
What you want to do is look for small to mid sized companies in your area and solve problems for them. You gonna build up your network and reputation.
There is a good reason many people don't go freelance, it is not for everyone. You need some really good social and business skills and it can be stressful. But the money is sure there.