So what would happen with an unlimited blocksize? Serious question - what would miners do? Would they include all tx, fee or not? Would they set a minimum fee? Would they choose a blocksize cap on their own?
Miners would blindly include all tx's.
Rasb Pi full node count would drop to 3.
Big Gubmint would turn off the 3 nodes.
Bitcoin ded.
See, you're just being kept safe by people more technically inclined than yourself.

[Oh, seriously... the same thing that happened for the last 5 years, miners would use soft caps. If people don't trust miners to respond to economic incentives, yes, even tangential incentives... they shouldn't own any to begin with.]