[Solved] "Sponsored by python-forum.io"

[Mekire]

Perhaps related, perhaps coincidental, chrome flagged one of my extensions as malware earlier this morning.

The extension was "w3chools hider" which blocks w3schools, or any chosen website, from appearing in google search results.
I looked to see if it was still available extension and although the search for it still shows a page with a highly rated extension, trying to go to that page yields a 404.

I wonder if this is the culprit as the timeing is pretty convenient.