From DOAJ News:
DOAJ receives regularly questions and, sometimes, complaints from libraries, library consortia and other academic institutions about the role which publishers—by “publishers” I mean the traditional publishing organisations in academic publishing—play in DOAJ. A common misconception is that DOAJ is owned by, or wholly subsidised by these organisations and that DOAJ is only of benefit to these organisations. If you looked at the DOAJ homepage two years ago, you’d be forgiven for making that assumption: nearly all of our sponsors were publishing organisations and they were all on our homepage. It looked like DOAJ was owned by publishers.
(Avoiding that misconception is also why DOAJ is very careful about who it goes into partnership with. The organisations we partner with must share the same values as DOAJ, have the same vision and at least be intent on providing services to the community. DOAJ is proud to call organisations like Redalyc, SciELO, ISSN and COPE partners.)
The assumption that DOAJ is owned by, or wholly subsidised by publishers is of course incorrect. Publishers play an important financial role in supporting the services which DOAJ provides to all stakeholders. Some publishers donate an annual sponsorship to us; some of them are publisher members. These contributions enable DOAJ to provide continuous services, and improvements to these services, for everyone but any direct influence on DOAJ stops there. In 2017 contributions from publishers accounted for 40% of the income, whereas contributions from public sector institutions accounted for the rest (60%). In 2018 income from public sector institutions will account for 70%. All contributions to DOAJ are made voluntarily; all services provided by DOAJ, including the evaluation of journals, are free.