I am wondering if a developed logic has been stated somewhere about at what point a company would migrate from private to public utility, but Google, Twitter, et al have certainly crossed the line, what with the enormous numbers using them, and how embedded they are in people's lives, with data-mining and spying abuse a given. Self-policing is a non-starter.
One or both of the polio vaccines was found to be contaminated with SV-40 by a researcher I believe out of a Rockefeller lab. When she tried to bring this out, her career was destroyed, the huge batch of contaminated vaccines that had already been produced was used on the public. Years later it was found that SV-40 could be transferred directly from vaccinated mother to child, at minimum in utero can't remember if there was mention of other avenues of infection, SV-40 was found in brain tumors in unvaccinated children of vaccinated mothers, maybe even second generation unvaccinated, can't remember.