Some thoughts on DDOS protection and spam removal on Layer 2s... or the scary word: censorship.
I'm not worried about L2s filtering transactions at all because of one important feature L2s have vs sidechains: exit functionality. Regardless of censorship, users can exit trustlessly back to L1.
Polygon users are currently stuck with the lag/fees due to the sunflower game. The scalability trilemma confirms that this will be a problem at scale with any protocol that offers low fees + speed.
Higher fees reduce spam, but also reduce usability. By having spam protection with trustless exit capabilities, chains can offer low fees + speed + decentralization, while still maintaining some filtering.
It's a guarantee that the larger the userbase gets, the more likely spam will exist. The best thing we can do is find a balance and allow users exit capabilities. This way if a sequencer gets too heavy-handed on censoring transactions, it's an easy migration to somewhere else.
This being said: There's a lot of nuance here, and general-purpose rollups must be much more neutral than application-specific rollups.
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