It's either there are a lot of activity going on in MetaRL or just my referrals to it just going up. Yesterday, I withdrew 3224 metapoints from them and just recently, another 2000 metapoints. Now that's about 1250L$ free lindens in just 2 days.
I have to check
With my curiosity, I was able to see what really happened. It seems like there's someone in my referrals who answered a survey in MetaRL which is worth 405 metapoints. There are also others that earned me at least 250 metapoints.
If you want to know more about MetaRL, go here.
If you want to directly sign up, join MetaRL here.