Everyone is aware that each merit sources have a particular section they merit people, but the problem is that all this thread listed are the major places people submit their profiles for merit, its good for a merit sources to support any thread that is created for rank up and unmerited posts.
As you know, everyone has a different understanding of what a quality post is, and the same thing applies to merit sources. They merit posts that they feel qualified and worth meriting, and because they are trusted due to the quality contributions they have made to the forum, any post they merit will be considered a quality post. Therefore, if they feel like not giving out merit the way some merit sources do, it is their own opinion.
If merit sources like Fillippone, The Sceptical Chymist, Ratimov, and DdmrDdmr decide to give out enough merits publicly to support users to rank up, that doesn’t mean all merit sources should do the same because they all have choices on how to share their allocated merits.