Is this problematic because of the links? Because FOSS is funded by donations and it's common for non-profits to acknowledge their sponsors. For example EFF does the same thing [1], but FSF displays only the logos with no links [2]. Are you advocating for the FSF version?
That's why FSF's listed sponsors actually care about sponsoring the FSF. The ASF "sponsors" pasted by the first comment and many of the listed EFF "sponsors" aren't donating money because they care about the foundations. They're purchasing links in order to rank higher[1], and a link just happens to require donating.
[1]: EFF uses rel=nofollow on all links to sponsors, so a listing on this page probably doesn't actually do what the buyer intended. Google covers this in https://support.google.com/webmasters/answer/66356?hl=en. In a sense, EFF gets free money from people who think they're buying better ranking but actually aren't. OTOH, ASF's decision to specifically sell rel=follow links - which do pass PageRank - is surprising.
[1] https://www.eff.org/thanks
[2] https://www.fsf.org/patrons