Yeah, it looks wrong to me too. It claims to be GPLv3 and the "use cases" explainer looks like it's trying to clarify what GPLv3 means, but the requirements described under the use cases are not part of GPLv3.
The 1st one is fine. The 2nd one says you would need to open source your modifications, but that would only be true if you also distributed your version rather than just using it on the server side. The 3rd adds three conditions. The first and third are again only true if you are redistributing the software. The second is an attribution clause that is not part of GPLv3, and the page to me definitely reads like it's explaining the license but not actually a license itself. GPLv3 does allow adding in similar conditions, but probably not those: I'm not sure requiring a link to the original project is ok.
AGPLv3 would be a much closer match to what the author appears to intend. It allows adding the attribution requirements that the author wants; see https://www.gnu.org/licenses/agpl-3.0.en.html section 7: "You may...supplement the terms...: (b) Requiring preservation of...author attribution..."
(IANAL, and every time I claim anything about licenses I get at least one detail wrong.)
The 1st one is fine. The 2nd one says you would need to open source your modifications, but that would only be true if you also distributed your version rather than just using it on the server side. The 3rd adds three conditions. The first and third are again only true if you are redistributing the software. The second is an attribution clause that is not part of GPLv3, and the page to me definitely reads like it's explaining the license but not actually a license itself. GPLv3 does allow adding in similar conditions, but probably not those: I'm not sure requiring a link to the original project is ok.
AGPLv3 would be a much closer match to what the author appears to intend. It allows adding the attribution requirements that the author wants; see https://www.gnu.org/licenses/agpl-3.0.en.html section 7: "You may...supplement the terms...: (b) Requiring preservation of...author attribution..."
(IANAL, and every time I claim anything about licenses I get at least one detail wrong.)