What has been the most significant development/progress to the tech in the last 2 years and who are the players in the space?

I thought it might be a good opportunity to have a discussion about what is actually happening in the space rather than have another ‘analyst decides moons are worth $5’ post.

I myself am not overly involved in the tech or have the slightest idea of how it works, but we have been in a pretty extended bear market despite the recent pumps, and I would assume a number of projects have continued to make significant developments during that time, or new projects with bold ideas have come out.

I know moons and their potential impact on social networks has become a theme of the sub, but is there anything else that has started the next wave of progress in the space?