These security warnings are standard (especially if you use Chrome, which wants their security products to dominate the market).

They do not mean "don't go in there." They mean "don't input credit card numbers there." Chip Guide doesn't buy/sell, and doesn't require us to use credit cards.

If you are afraid that a hacker will learn your password AND it's the same one you use for banking and other services, you have created the danger yourself by rejecting one of the top tips security experts offer: Use unique passwords. If hackers get into your hospital's website (as they do all the time - they even get their own people hired into healthcare companies to hack into the systems), you don't want the password they discover to unlock your bank vault. Mix them up.