I think Trello should be doing similar scraping, automatically. My work does, granted it is potentially a bit easier in our case. We scan things like GitHub repos and looks for credentials into our system, and, if found, deactivate the credential and reach out to the customer.
GitHub does this as well with API keys, I believe. If they find them in a commit, they'll automatically revoke them.
Slack does this as well with API tokens, I believe. If they find them in a commit, they'll automatically revoke them.
i'm guessing your name is timvdalen?
Maybe Trello could make the fact that the board is public more visible? Like a banner or somesuch?
I tried to create a Trello board just now and the default visibility setting is private. I assume that hasn't always been the case, otherwise people really went out of their way to make these boards public.
I don't think that was always the case. Recently I was googling my name and I found out I have bunch of Trello boards for various student projects that I completely forgot about (think "startups" but we've never gotten anywhere with them). I was surprised to see that. I don't think we deliberately made it public.
Made them "public" to share with a friend or so, not realising it is also indexed?