I started the Patreon page two months ago and it was pushing $100/mo within a week, and without any noticable disruption to my FOSS donations - it effectively increases my donation flow 3x-4x. Patreon is a platform people already trust with their CC# and people are already supporting other creators on. Reducing the barrier of entry can get you way more money, which makes a big difference. Patreon also makes it clear that your support is meant to be recurring, which has a big impact on the long term viability of the income stream.
I still accept donations through the FOSS portal, and point people there first if they ask me directly how to donate. But it doesn't make sense to turn down Patreon, either.
Aside: I'm working on an open source git platform too, I feel you wrt GitHub.