Extractive summarisation of news isn't very hard, I guess it doesn't hurt to put it in an API wrapper and have a pay per use model, but don't expect this to sell.

Also FYI, depending on the News outlet the important info is usually at the top - it's maybe the first thing they teach you in Journalism (don't bury the lede). You don't need to read the "Bible-size" article if you read the first paragraph and it's well written.

However, if you did abstractive summarisation instead, that might be more interesting esp for financial news - you might have buyers.