Help me understand why YT live quality is so bad at certain stuff vs other services (example in post)

So I should start with that I have no issues with youtube live streaming actual gameplay, that actually looks very good at higher bitrates.
My issue is with certain simpler images that gets absolutely crushed for some reason, like a logo scene as i will demonstrate below.

This is a screenshot from a livestream i did at youtube with 50k bitrate at 1440p with OBS AV1 encoder (VP9 in YT):
OzKL2zz.png (2560×1440) (imgur.com)

And this is the same scene but streamed to twitch at 8k bitrate at 936p with Nvenc HEVC encoder with OBS:
EZFOETA.png (2560×1440) (imgur.com)

Here is a 1:30 livestream vod from youtube with just the logo i did just to make my point, same setttings, 50k bitrate at 1440p.
https://www.youtube.com/live/ZgEvprojN1E?si=p89vrtcV-UoG1P_Z

As you can see the difference is huge, im just confused as to why a service with 8k bitrate and lower resolution can give SO better quality as YT with its superior encoder, resolution and much higher bitrate.

Why is this happening, am I doing something wrong?

Thanks.