So, it seems like a while ago @arbitrum has updated its Rollup implementation on L1 in a way that, IMO, dramatically increased its decentralisation. Funny, they kind of forgot to inform public about it, let's have a quick look: 👇🧵
You may be aware that being Validator for Arbitrum is still not entirely permissionless - you need to be whitelisted. Validators submit new L2 state roots to L1 Ethereum and can challenge each other /2
As a result of having a whitelist, if all Validators went down, nobody would submit L2 state roots and users' funds will be stuck. Hence the warning on @l2beat : /3 
But there is this new cool feature introduced just before ETH Merge that essentially drops the whitelist entirely if Validators do not submit new state roots in a 7-day period. After that anyone can become a Validator /4
All you need to do is call removeWhitelistAfterValidatorAfk() method on a Rollup: etherscan.io/address/0xa0ed… - it is permissionless /5
With that in place I guess one big red warning goes away, so it will be (once PR is merged): /6
I do encourage all projects to submit their PRs - no need for all these red flags to keep hanging there if they are inaccurate 🙈 /7
While we are at it, we are working hard to develop monitoring infra so that such changes will never get unnoticed in the future. It is complicated but very rewarding. If you want to help us out, please reach out. End /8
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