Here is a list with all users that received a claimdrop https://docs.google.com/spreadsheets/d/1cbCdCn7-LyIarcurn-N1_dpfAHWsAzvCE9HMiWi9n4k/edit#gid=1579377021

It depends on how much SP you have and not how active you are. Being active (I think at least one post or comment in the last 2 months) was only the requirement to be on the list. The claimdrop was capped to 2500 maximum per user.