Initial opening of profiles when we moved the privacy from 200 to 150/100 was based only on Birth/Death dated entered on profiles.
I prepared the lists of profiles without dates, that were surely born more than 150 years ago based on the relatives dates. We are opening them in groups, that are verified and opened. For public profiles we checked just some of the profiles, and for private profiles they were all checked, since by opening them previously private data is now visible.
I could give you the lists, but it is not worth looking at them. There were significant reduction in profile not opened, and big increase in 13x errors, since most of this profiles have no dates and are now opened.
We will continue this effort, since it also reduces the number of OPRs. I already extended the algorithms, to check for dates in 2 generations, so more profiles will be opened.