A few years ago I attended a conference talk from one of the Let's Encrypt folks. At the end, when he took questions, someone asked something along the lines of "what if the government targets Let's Encrypt for sneaky surveillance things". And his reply was something along the lines of "We're partially founded by the EFF. The EFF is actively looking for organizations that the government has done that with, in order to sue the government."

Edit: https://media.libreplanet.org/u/libreplanet/m/seth-schoen-le... the question is at 46:22.