Why? Because if one of them is compromised, then you have a big problem: All your other accounts are at risk too!

You should never reuse passwords between different sites and services. If one site gets hacked, it can lead to hackers gaining access to many more sites that share the same credentials. It’s like having only one key for every door in your house — you’d be crazy to do that! Instead, each lock should have its own unique key. This way if someone breaks into one place they won’t be able get into any others without breaking through another lock first
https://t.co/i6lDLRiml0