I flipped cars as a hobby during covid while in grad school and ended up making well over $100k. AMA!
For those unfamiliar, flipping cars is the act of buying and reselling cars for a profit in the same way people buy and flip houses after renovating them. I did the same thing, but most of the cars I sold were light renovations or bought straight up new from the dealer because I had an allocation other people couldn't get.
It was really fun, and I was really lucky to find a niche doing that. The state I live in has a limitation on the number of vehicles you can sell per month, so I had to get a dealer's license and LLC. But that worked out really well because one of the vehicles I flipped I was able to hold on to for a while as a "company vehicle" which became a tax deduction.
AMA!
Edit: to answer the easy question... it is absolutely not viable right now, or I would still be doing it.