Unlikely as the logs are appended to by CAs when they issue certificates. Browsers could in theory contribute data but the infrastructure to support that would

Unlikely as the logs are appended to by CAs when they issue certificates. Browsers could in theory contribute data but the infrastructure to support that would likely to be orders of magnitude bigger. I'm scared even thinking about going down that rabbit hole due to the expectation of what would be found (MITM evidence). :_(