To choose Dicio as your default digital assistant on Android (replacing Google Assistant), go to Settings > Apps & notifications > Default apps > Digital assistant app > Default digital assistant app. On Android 10+, this lets you activate Dicio by swiping from the bottom left/right corner toward the center of the screen.
This is great, one of the barriers to entry before was that you needed to manually open the app. Although I don't see that this resolves the issue of the wakeword/hotword triggered with "Hey Google" ?
The options to make a true opensource assistant that would work in the same capacity as Alexa/Siri/Google (invoked via wakeword) is therefore quite limited. An alternative is to have it listening constantly, maybe as a background service, but this would use up too much battery I suspect.
Maybe tasker/easer has something for the wakeword detection? That would be great.