This is what I was asking about ... when I wrote about time slots.

Judging by this data, all these accounts were blocked immediately after registration due to "evil IP" for this reason, "Never" was as the last active date.

The beginning of publications in 2020 can be explained by the fact that after a time (a year or three) the blacklists were dropped, the owner of these Alts came in and saw that the accounts were no longer blocked.