I personally removed DD-WRT a few years ago when I discovered that there were hard coded ACCEPT rules from specific IP addresses. The forum discussion with the upstream developer did not build up any confidence in my eyes.
The argumentation which was used was that "these IP addresses are not valid any more and we will remove these iptables rules in the next release". That was without an ETA of the next release and it was nobody who saw any need of informing its users about this. Despite that a couple of simple 'nvram' commands was all which would be needed as a workaround.
So that the DD-WRT community does not see littleblackbox as a problem for their firmware, that does not surprise me at all. For me this is yet another reason why to stay away from DD-WRT.
I switched to X-WRT and later on to OpenWRT, and I find these two as much more open and secure router distributions. And it is quite easy to build the OpenWRT firmware yourself.