@Philip Taylor I was merely using medical science as an example profession. It’s quite obvious that you don’t have any professional courtesy and downplay professions in which you don’t understand. Logo design isn’t just logo design. I don’t know what the profession of a public accountant entails, or a lawyer perhaps, so I’m not going to give advice on matters that I don’t especially have knowledge in.
You know those top-down cooking or craft videos you just can’t seem to get away from these days? There are people out there making a living from them. 78% of B2C companies depend on user-generated content, like those videos, for their marketing campaigns. You can sign up as a creator on a site like Darby Smart and potentially work with brands like Nordstrom, Mattel, and BarkBox. Or, learn how to master PPC advertising and you can use the content to build your YouTube following and monetize through ads and views.
I’ve tried a fair few things on this list and I’m a big fan of those side hustles that have the potential for ongoing passive income once you’re set up. For me, the most successful have been blogging and T shirt designs (I use Merch by Amazon but want to look into Teespring as you suggest). I’m currently working on an Etsy printable business, again for the passive income potential!
Get your mind out of the gutter. There's nothing illegal going on here because there are several ways that you can cash in on your body. Obvious places to start would be modeling or acting. Art models, for example, can make between $20 to $25 per hour. However, you can also participate in medical studies or sell everything from plasma, sperm, breast milk, and even donating eggs for approximately $5,000.