Become a huckster, as Lenin would call it. Import stuff and sell it on Craigslist. Only works if you have starting capital or know some people who travel outside the country a lot to get cheap shipping rates. Also sketchy.

Adjacent to this, you can scrounge junkyards to repair and resell appliances.

Offer services such as childcare, lawn mowing, cleaning, or auto repair. Stuff that working families can need.

In all cases, you do need to do some marketing and market research.

Scrapping

simple, you just be a capitalist and with a small $5 million loan from your mom or dad you pull yourself up by your bootstraps and become rich.. its pretty easy and anyone who works hard enough can do it

I've downloaded survey apps and done surveys and have actually gotten paid

You could offer "under the table" services and insist on cash-only payments. If elderly or infirm have cars and need to go to appointments, shop for groceries, or other services. You could sit with children or elderly, offer cleaning or cooking services, etc.

Make sure to work for honest, reputable people so you're more likely to actually receive your pay. This may mean more like park or afternoon tea (I know), while being more quiet while offering to wash up after, so you can hear conversations/gossip without asking overt questions.

For example, when I was new in my old neighborhood, I made friends with a local who clearly made no secret of wanting sex, but also didn't try to force anything. I would attend card and dominoes games, barbecues, maybe hit a blunt being passed, but otherwise play on my phone or job search on my laptop, while also listening to what was being said without comment. I also gave him rides for only the cost of gas. I also made sure to be friends with those usually rejected by others. Not too much, but enough, because it was just decency.

im sure there are support groups in spain if you have a medical need. you could also apply for state assistance.

a lot but its gonna be dangerous

I remember people doing translations/approving translations but now is probably just AI.

Depends on where you live really but outside of black market shit you're only really gonna get paid through some sort of labour, be it online or otherwise.

Id also recommend looking at matched betting and bank account swap bonuses.