Allow nudity or at least partial nudity like other social media apps like Twitter,Instagram, YouTube ect. The majority of Twitch users are now over 18 years old according to recent data (Links Below), and adding 18+ content could expand user base IMO
https://www.streamscheme.com/twitch-statistics/
https://www.businessofapps.com/data/twitch-statistics/

As for users under 18, Twitch can add strict age verification rules, All Korean streaming sites already do this & 18+ content can be demonetized like YouTube does with adult content, if advertisers have a problem with their ads running on any of the content. Also it's important to note that apps like Twitter have had full nudity & even full sexual content on their platforms for years and it doesn't seem to draw any negative attention from advertisers or the public. I think it's also important to note that Twitch already has many streamers that have such Twitter content linked in their Twitch Bios & most users & advertisers appear fine with it.

We also know that Twitch considered making a new mature tag or category before (Links Below), however we have never heard any updates.
https://dotesports.com/streaming/news/twitch-considering-new-content-policy-with-mature-tag
https://www.youtube.com/watch?v=C7lJkvZhA0Q

I think as a community we would love to have a more open & free terms of service with still some restrictions when need be & would love to hear back from Twitch on this idea or something similar in the near future.