There are tampermonkey script(s) and ublock filter scripts that swap out the advert video with the live broadcast video (but in low res) - i have lived with that for now, esp. since i watch esports on twitch, and it sucks that i would have missed key moments of a game when an ad plays during it!
There's several ones listed here : https://github.com/pixeltris/TwitchAdSolutions
I use the scripts (https://github.com/pixeltris/TwitchAdSolutions#scripts) instead of the proxy solution, as i dont want to rely on a third party server to be working.