@djsundog It's not one's dev sandbox, but it *is* a massive trove of text put up on a publicly-accessible network, retrievable via unauthenticated clients. The author's consent is not technologically necessary to access it, and may or may not even be audited by the administrator of the service.
It *will* be indexed. It's only a matter of time. I appreciate the appeal to "Don't be that guy," but everyone with something to lose *must* understand that if it's really, really important to them that their toots not be searchable, a solution of "trust eight billion people not to build the thing" is completely untenable.