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Commercials Are Streaming’s New Norm, and Creators Aren’t Happy: “It’s Almost Worse Than Broadcast”
(www.hollywoodreporter.com)
This is a most excellent place for technology news and articles.
Content providers can probably include chapter markers in their content. I also suspect it's not hard to detect a scene transition. Failing these, randomly placed.
This was my problem with hulu back in the day. Short episodes like Futurama would have a commercial shoved in at like 3 minutes and then again at 10 or whatever, it was obnoxious and shittily implemented.