Comment by baobun

So the way Ethereum comes in is that the community at large is moving user activity to "L2s" - separate blockchains (sidechains) usually rolled up in and therefore secured by Ethereum Mainnet. Some of the newer L2s where apparently using this. So it affects Ethereum to the extent that its users could be bridging witg unsane protocols and implementations.

There are usually "bridge contracts" deployed on Mainnet to allow briding assets/tokens between them. This (besides obv exchanges) is where most of the ridiculous hacks and online theft of past few years have happened. The Axie/Ronin hack was a huge facepalm and should have been a lesson to be more wary of handwavy security claims of these more experimental networks.