I assume then, the stats sites will show a downward trend in team and project historical stats even though it probably doesn't represent reality or will the team and project level data contain the restricted data. If the restricted data is removed from the aggregate level data, then it will be interesting to see if new users allowing data export offset or exceed users restricting data export. With all the "ifs" and "known absences" what reliable conclusions can be drawn from the stats? One team may show a drastic drop just due to the percentage of team members that chose to restrict versus another team with no members that chose to restrict. How does this effect challenge stats? Crunchathons? Pentathalons?

Aggregate stats are unaffected since they do not have personal info.

This means that if you look at the stats for a team at the team level (i.e. total stats and team history) those stats include the contribution of both public and private members. However, if you look at the members on a team, those team members who have choosen to be private are simply not included in those lists.

Thus any sort of challenge stats that look at aggregate totals should not be affected.

Confirmed, my stats scripts just downloaded the data. Will watch the update

As info for others here are the before and after numbers from the tables.xml

Before
<update_time>1527100490</update_time>
<nusers_total>541976</nusers_total>
<nteams_total>26209</nteams_total>
<nhosts_total>3608752</nhosts_total>

After
<update_time>1531515841</update_time>
<nusers_total>542051</nusers_total>
<nteams_total>26265</nteams_total>
<nhosts_total>3731828</nhosts_total> <nusers_deleted_total>2538</nusers_deleted_total>
<nhosts_deleted_total>3516</nhosts_deleted_total>

Thanks jhindo and the rest of the IBM/WCG team! Great to have stats again.

And thanks to all the patient volunteers who stuck with WCG during "The Great Stats Outage of '18"

Cheers!

also a big thanks from my side; the solution choose by WCG, BOINC and other participating projects with the additional export files of users/hosts opted out is a good one.
Hope those files are not growing too much after the initial interest of trying that functionality.