So, I resorted to a few low-quality hacks.
The first was a QR Code parking app. It worked by just placing a qr code on public parking meters. I marked up the parking from like from 50 cents to a dollar. I kept 50 cents and payed for the parking through the official app with mitmproxy. Someone eventually reported it.
I had to ask my dad for help reimbursing the city—which he was not too happy about.
The second hack of a washing machine was disclosed properly, although no firmware patch was ever released.
[1] https://news.ycombinator.com/item?id=29814973
[2] https://shakey.blot.im/reverse-engineering-a-popular-laundry...