First, that is for Conveying Modified Source Versions. See the definition of conveying:
> To “convey” a work means any kind of propagation that enables other parties to make or receive copies. Mere interaction with a user through a computer network, with no transfer of a copy, is not conveying.
Generally the common position here is to use the AGPL if you want to cover regular network access. Probably all a bit murky because the GPL does not really fit well to things like this. But mostly it does not apply here, pretty specifically by definition.
Maybe you'd have a point regardless if the source was directly the HTML and CSS. And it seems like I was wrong with the modification notice (but I wasn't thinking about modifications in particular). But it's not HTML and CSS directly. Having looked at the source in question now the transmitted HTML and CSS is evidently not the source code, as both is produced by template files.
> To “convey” a work means any kind of propagation that enables other parties to make or receive copies. Mere interaction with a user through a computer network, with no transfer of a copy, is not conveying.
Generally the common position here is to use the AGPL if you want to cover regular network access. Probably all a bit murky because the GPL does not really fit well to things like this. But mostly it does not apply here, pretty specifically by definition.
Maybe you'd have a point regardless if the source was directly the HTML and CSS. And it seems like I was wrong with the modification notice (but I wasn't thinking about modifications in particular). But it's not HTML and CSS directly. Having looked at the source in question now the transmitted HTML and CSS is evidently not the source code, as both is produced by template files.