yeah ,its true
Because of this, anyone at any given point of time can join or leave/read/write/audit the public blockchain ecosystem and the network will still be trustless.
Trustless here means you need not set-up a trusted party or entity to overlook the operations on this type of blockchain and yet it will be censorship resistance.
The catch is that this type of self-governed, decentralized yet trustless autonomy is ensured on the system by its method of decision making which is very difficult or nearly impossible to tamper with. This decision making is called in this realm.