Transaction costs. It's actually suspected that happened during the blocksize wars when proponents of forks like Bitcoin Cash may have been spamming Bitcoin wi

Transaction costs. It's actually suspected that happened during the blocksize wars when proponents of forks like Bitcoin Cash may have been spamming Bitcoin with transactions to feed their narrative that it is too expensive to use. You'll eventually go bankrupt if you do this long enough. This is actually another reason unlimited blocksizes that can allow for very low to no cost transactions are risky, and DDOS protection is likely why Satoshi added the 1MB limit in bitcoin to begin with.