I noticed a while back that a lot of the brainwallets in the collection were filled with exactly 20108 satoshis, with phrases ranging from single words to some random seeming passwords. The repeated amount seemed weird, and I then discovered that someone back in 2014 had filled 456 addresses with exactly 20108 satoshis each.
I suspect this is some form of challenge/canary where each address is a different brainwallet, with varying levels of complexity in the phrase. Here are the transactions I've found so far:
Now, to the real reson for the post - I just noticed that after almost a year of no activity, someone has started draining a few of these addresses again. I wonder if this means some more optimized brainwallet cracker has been developed, or someone has built a cracking machine that's much faster than previous attempts. The curious thing is that the drained coins go to both standard and segwit addresses, so it might indicate there are multiple people working on this cracking.
And as always, if you use a standard SHA256 brainwallet, this is another indication that your coins will be taken sooner or later.