Not the full bit rate in the stream?

I wanted to start streaming and created a Twitch acc, but I can only stream at 6000 rate, but I want more and at obs is also set more but it only streams to 6000 why?

Because that is the limit that Twitch sets.

But I checked that you can actually stream with more, but then the viewers can't always lower the quality?

About 40% of the page comes the following point:
, Twitch specifies a maximum bit rate (bits transferred per second of video) of 6000 kbps "

Source: https://help.twitch.tv/...te%20video.