My feeling is that those that openly brag about it are the PvE/Ganked, rather than the combat logging ganker. The PvE/Ganked are less of an issue. It may also be that frequent use of the report player function against the Ganked CL may be given the 'boy who cried wolf' treatment.
Truesilver, do you & your group regularly report CL'ing Gankers, and do you see any noticeable effect from doing so?
Personally I report every log via the in-game report function. I have frequently offered video 'if required' but never been asked for it or heard anything further. Others go further with support tickets.
I can report the following concerning the regular Eravate combat loggers, based on my experiences with my (former) player group, Adle's Armada.
There are about half a dozen of them. Between them they have several thousand sidewinder kills and one of them in particular has boasted of having two or three thousand personally. (This is quite credible.)
All have been reported for combat logging multiple times and some by multiple different groups.
All are still in Open. Two were seen (and screen grabbed) talking together in Eravate local chat about the warnings they had received from Frontier and saying (I quote) that they might not log as much in future.
Any shadow bans (if any) ever given have been of such short duration as not to remove those applicable from the Eravate bounty board (in other words, less than a week, as they have to top their bounties up weekly, or they are removed).
One logger was exposed on reddit - the main sub - when you were still allowed to do that. There was so much outrage at the time about this guy in an Anaconda killing stacks of new players and then logging to Adle's Armada that Frontier Support actually got involved in the thread.
This is the one, single, example I know of of any kind of visible response. He might have been shadow banned because he did disappear for a little while. Then he came back with a different name (... he blabbed ...)
In short, my entire experience of reporting combat logging is that it achieves nothing.
As at this time, sadly there appears to be nothing to prevent anyone from going to Eravate and killing as many new players as they want, while combat logging if Adle's Armada catch them. Valiantly my former comrades can and do reduce the kill-rate by running interference, in effect, but against a logger, who is hence immortal, only Frontier could act - and it appears, they will not.
The saddest thing about it all is that even though we all have infinite money now, I can also report that you only need to blow someone up twice to stop them coming back. There is something about being blown up that sidey-slaughterers do not like. It can't be the creds so it must be something else.
So, basically, if Frontier could just deal with the logging, vigilante justice could be done, with considerable beneficial effect.