The fact that their CFW is dead and all benefits of the CFW are becoming increasingly more outdated is the problem with closed-source software. When an open-source project shuts down, for whatever, someone can just pick up the project, we saw this with ReiNAND to Luma3DS and Rei-Six and freeShop. SXOS does not have this benefit and all future community benefits died off when the team died. The documentation would be the exploit used for their Mariko chips. Something explaining how they went about making their boards and so on. Since they are gone, we don’t have that information. That’s the issue with closed-source, it creates a dependency on the team and that only hurts the community when/if the team gets shutdown.
As for the second part, the things you listed were PR, that’s why they did them. The fact that they even promoted their products here were PR. They were a team that wanted people to buy their products and depend on them. Their target audience was just anyone buying their products and it seems like their efforts to “help” the community were more done for PR than a genuine effort to help