I was reading this question that mentions plain text writers – I was not aware of this site before and I checked. I've noticed that many entries on the list date from 2011 (all of which I've checked, which is a lot less than the total of 5000+).
There is a "reformed" section but the list of offenders is much longer, with some sites that I have used in the past. The entries I've checked contain only one message with a screenshot showing the problem, but nothing more.
Do we know that the list on Github is still valid (that is, the entries on the offender list are still known offenders, even if their only registration was in 2011)? (The list itself has recently been updated with new additions.)