I like the idea of bitcointalk thread because it's being bumped each time someone comments so the idea is being advertised. I'm not that familiar with Github, is there this kind of mechanism there? Of course the cooperation of many people would be preferable.
Yes, the Bitcointalk thread has its advantages, and SEO-wise it would not be convenient to just copy the list to the Github Pages portal in an identic manner. Instead, a Github Pages (or other similar free web page provider) webpage would enable to create sub-pages for the involucred coins. These can be described, and there could be also links to proofs that the start was fair, there was no ICO etc (on most cases a link to the Announcement thread would be sufficient).
Another advantage: If someone has new informations about one of the coins, or a new coin is to be considered, he/she can simply propose an update to the page with a pull request - or request editing rights.
I can also reconsider the small 1-0.5BTC/day coins for a minor coins list, but there are risks to mention coins that has heavy issues that are difficult to understand without a deep study.
What timeframe do you use for the volume? I think a larger timeframe (at least a month) should be used to prevent short-time peaks. Unfortunately, I don't know if Coinpaprika provides that number (at a first glance I've only found the 24-hour-feature).
A list with several "tiers" would imo solve that problem - one could warn that smaller coins may have issues, and most people will know that low-volume/marketcap coins are riskier than big ones.