They used the AGPL for the server, but also told their users that it would not affect client code (the applications the users write). As a result, it was rather unclear whether you would even have to distribute modified server sources if you offered a public database service using the software.
Furthermore, the AGPL is only a deterrent against competition if the competition needs to modify the source code and does not want to share the modifications (assuming the the source code disclosure obligation actually kicks in at all). Neither of the cited organizations is vehemently opposed to sharing source code, so I do not think the AGPL (even applied as intended, which the original authors of the database software did not do) actually deters commercial competition here. It probably would not have prevented revenue seeping towards third parties offering services related to the software, either.