[SoftTalker]

DNS names have the same problem.

Once they are not renewed, they eventually become available again. Then anyone can re-register them, set up an MX record, and start receiving any emails still being sent to recipients in that domain. This could include password reset authentications for other services, etc.

[icedchai]

Yup. You can get control of valuable assets this way, like legacy IPv4 blocks.