If it's on Github doesn't that make it OS?
No, when talking about open source software, people typically refer to a definition along the lines of the Open Source Initiative's Open Source Definition. To distinguish this from software that you can only see the source (but don't have rights to copy and modify it), they'll use the term Source Available Software.
I don't really know about the software you guys were talking about, but the repositories I looked at used the MIT license, which is OSI approved. However, that might not be all of the code they use. It's not uncommon for a company to open source a "base" version, but they deploy a version that's altered from that (I've got no clue whether they do or don't).
Why did she get the endorsements? Did she promise to end Medicare or Social Security or do whatever the Republican platform is now? No, it's because she's not Donald Trump and these people think he's such a dangerous person to make president that they're willing to endorse a Democrat in the hopes it'll convince other Republicans that they should vote for Harris.
Is that self-own?