Sessions, Shared Phones and Saved Passwords
A saved session is a small convenience with a long tail. It keeps a balance visible to anybody who picks up the device, keeps the game one tap away at the moments you would least like it to be, and on a shared phone turns a private habit into a public one. Where the device is not exclusively yours, the browser without a saved session is the arrangement that causes fewest problems.
Never let a browser or an app store the password for a site holding funds. It is a two-second saving against a category of loss that is genuinely difficult to reverse, and it is the single most common way a small gaming account becomes a larger problem.
If You Registered Somewhere You Should Not Have
Change that password anywhere else it appears, starting with email and banking, and do it before anything else. Assume the address and number are now on a list, and treat the "your account is ready" and "verify to claim your bonus" messages that follow as hostile — they are the standard follow-up, timed to arrive while the registration still feels legitimate. If an app was installed during the process and granted SMS or accessibility permission, revoke it, uninstall, and change the important passwords from a different device.
For judging the link that led you to the form, see the address checks. For the format itself and what a round actually does, start at the home page.