
The number of posts per day is a useful metric to measure activity, but the total number of posts, or specifically the reduction in the total number of posts, indicates lost posts. Luckily, thanks to federation, many of the posts live on on other servers, but it’s still a huge loss of data,
Lemmy uses ActivityPub, so people can use all sorts of software to interact with Lemmy. I happen to be using Hubzilla, for example. In statistics, I would be counted as a Hubzilla user, not a Lemmy user.