

Sure you can have a unique identifier. That’s not the issue. The issue is that anyone can contact you via your phone number! This is not a problem with chat apps where people need permission to add you to their contact list. Why not have a system like that?
Same goes for credit cards. They should need to ask for permission to charge your credit card. Merely knowing your credit card info should not be enough.
Stay away from gambling sites. If you’ve got extra money and want to watch it grow, invest in Exchange Traded Funds (ETFs) with a low/no fee trading account. Stay away from meme stocks as well.
If you do invest, diversify your portfolio. SPY is very exciting but it’s heavily tied up in the AI bubble. Try to more international markets, clean energy, minerals, heavy industry. No matter what happens to the AI companies, we still need energy and resources to build stuff and keep our economy going.
Read about taxable and non taxable trading accounts in your country. Try to use those to avoid having your savings eroded by taxes. You will pay plenty of taxes on your income, so don’t worry about that!