the-federation.info chart showing total registered users went from about 4600k in October to 7700k at the end of December, and added 300k more in January (which is the minimum amount to be decremented from the MAU of the end of January for comparison with one month before). The figure hopefully doesn't include daystorm.netz.org which starts its stats in May.
https://mamot.fr/system/media_attachments/files/110/691/618/091/280/578/original/49e8475518dd4d94.png