The OP body:

I own mylocalhost.com, never really done anything with it in the last 24 years I have owned it.

Though lately and being the curious type, I have started logging the traffic.

All I can say is I would suggest if you have ever used it as a test domain ( thanks AI for using it as a recommended "test" domain )

I would rotate any sensitive data that you may have sent it.

[mdash was used on purpose]

I honestly didn't even know that, had to look it up just now. But it makes sense... these days there's a domain for everything