Yes? Facebook's MAU is almost half the world population. Hell, their daily active users is almost 2B.

Facebook claims 700+ million login daily but many are bots.

It doesn't matter because you are not talking or interacting with them. You have a small list and unless you explore groups.

Most of the world uses google search outside of China. I don't feel connected to them and if the volume dropped to a few hundred people using google search it wouldn't affect my experience.

Facebook isn't a community site it is a social media with expectations that you consume more content than you contribute.