For a lot of the cheap stuff on Amazon, the price is literally double at a local brick and mortar retailer. Phone chargers, kitchen utensils, towels, cleaning products are high-margin examples that come to mind. Plus, of course, your time and gas money to grab it. Some people also struggle with impulse purchases they may grab while shopping in store. Its easy to see why people continue to throw money at creepy Bezos and just wait for shit to appear on their porch.
I’m not the person you replied to, but it’s great for telling you why the check engine light is on. If you’re somewhere that requires emission testing: you can diagnose if you have an exhaust leak, bad O2 sensor, clogged catalytic converter, etc. Besides that: its good just to know if the check engine light can be safely ignored.