Nailing the 95 Thesis to the castle door wasn’t as epic as it’s usually made out to be. Castle doors were actually the billboards of the time - Luther’s script would have been up there alongside the 16th century equivalent of bake sale advertisements and missing cat posters.
It was also in Latin, and couldn’t be read by the common person, because Luther didn’t intend it as a revolutionary document. He simply wanted his questions answered by the Church. Problem is they couldn’t.
Nor did Luther intend to spread his texts - it was the local printers, the new-age journalists, who snapped it up as a great story and created one of the world first (and surely most impressive) hype snowball campaigns.