Why you need a unique username for every account. The main issue with usernames is that they are public, not hidden like your passwords. Reusing the same username makes it easier for malicious actors to build your online profile. It also makes it easier for advertisers and random people to find and track you online.
- Is it OK to have the same username for everything?
- What does it mean when your username must be unique?
Is it OK to have the same username for everything?
Even if you don't do online banking, a bad guy could use your email address for spam or even acquire credit cards, purchases, etc using your email address as a contact point. This is just one example of something that could happen as a result of using the same username and password for everything.
What does it mean when your username must be unique?
Having a unique username means there is only one possible password for that username. If it's wrong, you don't have to go looking for another user with the same username to compare it to. It's gets really complicated when someone requests a missing password.