Some, probably not all. Same thing with the dark forest idea: some may buy into it, hard to argue none ever making a grab for more. Having so much more stuff seems like a pretty robust dominant strategy against a bunch of smaller terrified entities hiding in the forest lobbing relativistic missiles at discovered others (such lobbing itself being somewhat self-exposing). And at some point shouldn't von neumann probes let one dominate a forest/galaxy if growth to rearrange tons of natural-looking matter really must take vast amounts of time?

Article does a bad job summarizing the great filter position, and seems unaware of the follow-up on grabby aliens -- the latter being fairly convincing as a resolution to the paradox.