Over 20 years ago, the San Jose Mercury-News offered exactly such a service.
Called Newshound, it let you set up to face sets of keywords (in the basic $5/month subscription), and it would email you the plain text of every article that matched the criteria, whether generated within the publisher network or from wire services.
Called Newshound, it let you set up to face sets of keywords (in the basic $5/month subscription), and it would email you the plain text of every article that matched the criteria, whether generated within the publisher network or from wire services.