According to wikipedia, Open Philanthropy was founded in 2017. I would've thought that suddenly becoming billionaire-backed would lead to a big jump in the amount of funding being deployed, but when I look at plots of funding over time I don't see any.
Why?
Firstly, from the plot that you link (at least the one on the right) there actually seems to be a clear jump (total in 2017 is 300M from 150M the year before).
Secondly, I think the main reason is that Open Philanthropy didn't just come into existence out of nothing, they started a partnership with GiveWell in 2014 (as the Wikipedia article says as well) and Good Ventures have already been giving through that, so it's not that suddenly a new funder was there in 2017, it's that a funder has been easing in over a long time and the founding of Open Philanthropy as an organisation was just one step in this process.
Wasn't it just called GiveWell labs before 2017?
PS, I'm asking because I'm working on a "history of EA" video. The idea is that this is a nice narrative-driven way to explain the EA memeplex.
Cool, yep. This checks out.
Thanks!