This is a natural result of most of the influx of new users being from Reddit as they're still keeping an eye on it to see how the situation evolves. I expect it to continue happening until at the very least a week after the beginning of July, which I expect will also be a second migration wave since that's when the third party apps will stop working.
It'll settle down eventually. In the meantime, users seem to have been doing a good enough job of keeping those threads on the communities/magazines dedicated to talking about Reddit and/or the relevant migration, so it's probably best to unsubscribe from/block them if you are sick of seeing those in your feed.
