Thanks! SponsorBlock is definitely a better option here.

There's a way of making this thing perform really, really smooth if you excuse the pun, but it requires some upfront cost, e.g. fine tune an LLM or use something like ULMFit. GPT is great for prototyping these sorts of things but I think we've become a bit narrow-focused recently due to the entire ChatGPT hype.

Give the site/article a read for more context if you haven't!