More info here

Every 30 minutes a bot fetches live channels from the Twitch API to make the channel list. The answer is updated using the API just before starting the game but it can still be off because the API is not as accurate view count on the embedded stream. Some channels might also have gone offline during the time it takes the API to update.

You might encounter a "Preparing your stream..." screen at the start of each round, to get rid of them you can subscribe to Twitch Turbo or change the video type to clips or get a better Adblocker :)
If you have Turbo but still see the screen, make sure you are logged in to Twitch on the same browser. If you use Firefox you will need to allow cross-site tracking cookies

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If you want to optout from being picked for the guess list you can use the =optout guessr command in OkayegBOT's chat

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Channel list updated on [updates when game starts]