That's been my experience with BeReal as well. I seldom see posts from people I'm close with, and so I post less as well, and presumably that contributes to a similar feeling for other friends of mine.
In fact, these days, I only post in it so that I can record the moment, to add it to the record of fotos which are convenient and fun to look back through.
I liked BeReal while it was still just post 1 picture a day. Now you have 'your brands' there, they try to increase 'engagement' by trying to get people use the app more... I was there when it happened on Facebook, I was there when it started on Instagram – not again, thx.