It's indexed because, as you say, it's transmited completely. So maybe just disabling js it's readable. I have economist.com disabled in uBlock Origin (it works

It's indexed because, as you say, it's transmited completely. So maybe just disabling js it's readable. I have economist.com disabled in uBlock Origin (it works), but I guess that disabling all js would work too? Because of that, I think not taking measures against this behaviour is the lesser evil. (edit: small potatoes)