Also, part of the reason MG is able to be so comprehensive is because of the crowdsourcing of its data. Even though some companies understand MG's importance and create their own module listings, the majority of the info here comes from people who know synths and know when they're seeing something new, ergo they add the new data to the site even faster than a company might. For example, I came across listings on Schneider's Laden's site for the four new "N" series modules from Analogue Systems a few days ago, and added the information as per Schneider's.
Which brings up a salient point: if you're going to add information to MG's database, it needs to be from a reliable source. Manufacturers are certainly that, but so are retailers, as they need to properly represent the gear and its information to their customers. What's NOT on is pulling info from speculative sources such as blogs, forums, etc when the info isn't coming from manufacturers to those sites in the first place. There's a long trail of rumored devices, fakes, speculation and conjecture, etc in the synth world and a comprehensive and authoritative database such as Modulargrid isn't the place for that.