A few weeks ago, the standard banmalware list covered ~300.000 IPs.
Now, it went gradually down to only ~44608 IPs.
Why?
And can someone recommend a bigger, well maintained list?
Why do you think it means the list isn`t well maintained? More IPs does not always mean better, it can mean a lot of incorrect entries blocking legitimate sites.
You should talk to the maintainer of the list if you want to know what were those removed IPs.