” Rambam said one should not be hitztarech al haBrios, and even Hillel HaZaken and the Chofetz Chaim in our times earned themselves a living.”
We don’t posken according to the Rambam; we posken according to what the Gedolim of our times (who know how to learn and apply the Rishonim) say. Rav Moshe Feinstein zatsal has a teshuva in which he speaks out very harshly against people who don’t go to Kollel because they don’t want to take money from the tzibur.