A real employer has an HR page. A real bank has a branch locator. A real software company has a support number you can call, even if you wait on hold. You can search the company name plus the word “headquarters” and find an address. You can call the main switchboard and be transferred to the person you have been talking to. None of this is exotic. It is the baseline of being an actual business.
Job offers conducted only over text message, support agents who refuse to speak on the phone, recruiters who only exist on WhatsApp, and companies whose website is one page old are not unlucky or modern or remote-first. They are not companies. Before you give anyone documents, money, or hours of your time, look the organization up independently and confirm it has the normal shape of a real one.