If you host multiple applications on the same domain, or use a domain which
is controlled by someone else (for example: wordpress), the localStorage
across these applications will be shared.
This can be a useful way to have multiple applications communicate with one
another, but can also present a security issue, if you place sensitive data
in the localStorage, or take actions on its value.
Keep this in mind when developing applications on shared hosting.
Note that ethers.space does not have this issue, since every application is
hosted on its own domain name (eg. myapp.ethers.space).