ThankYou Points are one of the four major transferable points currencies and as such are pretty valuable to frequent travelers. One of the benefits of ThankYou points is that you can combine your own points from different account and you can also transfer them to other people.
Citi has now added a limit to shared ThankYou points. This won;t affect your ability to combine your own points.
The total number of points a member can share is 100,000 Points in a given calendar year and the total number of points a member can receive from other members is 100,000 Points in a given calendar year.
This will probably not have a big impact for most people but it is a step in the wrong direction.