Fortunately this attack is greatly mitigated by the fact that reserved memory is “not transferrable” and that initial memory costs will still be about 100x more expensive than buying actual physical RAM. Every byte of memory used by the network is replicated and stored in over 100 full nodes and often many partial nodes. The network has to pay these people enough to justify purchasing and maintaining this real memory.
This is pretty new information for me, thanks for informing with such a great insight.