Also V8 underpins Node, which has many more legitimate use-cases for that much memory. That said I think we need some sort of user-facing permissions constrain

Also V8 underpins Node, which has many more legitimate use-cases for that much memory. That said I think we need some sort of user-facing permissions constraints for memory usage and/or webassembly execution. I fear that in practice this new capacity will mostly get used by unscrupulous crypto-miners.