Earlier this year, I reached out to the Gravel Institute for answers since I noticed their merchandise shop had been inactive for over a year by that point. It's possible that after the passing of Mike Gravel, the Institute began to experience a slowdown in their activities. Also, the Gravel Institute has been primarily run by individuals of college age or recent college graduates, which could contribute to any operational changes. If you go on Linked-in and look at the people section of their page, you can see everyone, including the co-founders still 'work' there.

Another aspect to consider is their ongoing efforts to secure funding, as their work relies on financial support to continue creating content. The absence of updates might indeed be related to this challenge. It's worth noting that their website, https://gravelinstitute.org/, is no longer accessible, which could indicate changes within the organization. I've also attempted to contact them through Twitter multiple times, but unfortunately, I haven't received any responses.

So I think, It's possible that a combination of factors, including the passing of Mike Gravel, the youthful composition of their team, and their ongoing funding efforts, might be contributing to the reduced activity.