But SSPL was not approved by OSI. BY "investing" I mean getting it to the same status as AGPL :)
Now technically maybe it could meet the OSD if it required a royalty for hosting the software as a SaaS product, instead of banning that - since it allows "free redistribution", and passes on the same right to anyone receiving it (it is defined in terms of prohibitions on what the licence can restrict, and there is no restriction on charging a set amount for use unless that requires executing a separate licence agreement).
Now arguably this is a deficiency in the OSD. But I imagine if you tried to exploit that, they might just update the definition and/or decline to list your licence.