Tuidang movement (退党, Falun Gong media)

Falun Gong campaign asking Chinese people to revoke their CCP membership.

Extremely common when Falun Gong preaching (法轮功传教) on the streets in touristic areas where Chinese tourists will be present. Fake names will be accepted, so it is obviously just a symbolic act.

A bit less than 10% of the Chinese population are registered CCP members: https://en.wikipedia.org/wiki/Chinese_Communist_Party. So it is not obligatory, and there likely restrictions. But there must also be some kind of benefits involved. See also: https://daily.jstor.org/communist-party-of-china/