Agree, the logo should not be modified there. This is not aligned with the logo guidelines. If a conference organizer or alike would do this it would be a no-go.
Someone pointed out to me that the logo in our GitHub profile had disappeared and that it was a flaky bug. After some time I checked again and it was still missing so I uploaded a logo I had. If someone wants to fix the logo, please do!
Plone.com: I exported it to static HTML as part of the big AI team server sprint in August. I guess that image file came out lossier. Sorry! You guys kill me. We are doing the best we can. Very few people are helping with the AI team. No one has stepped up to help rebuild Plone.com or to help fix bugs (BIG HUGE BUGS) in Plone.org. So when I see folks nitpicking about logos and styles and complaining to me about how long it took to fix and reenable the Plone.org byline, I have to shake my head.
Thanks for explaining and fixing. Just our of curiosity, @tkimnguyen where did you get this logo from? I've also heard positive voices about the change
However, I don't blame anyone - I know it's a community effort.