We have an issue with strange subdomains pointing to (pages on) our site such as:
A few things are perplexing:
- who created them? why they do that?
- why Google index them and made them appear in the search results when clicking them gets a 5xx error.
- how can we get rid of them?
It seems some type of scams that hurt our site's free search and experience. Anyone had similar experience and knows the answers?