The counterexample to your claim is FamilySearch.org, which worked with Reclaim the Records on digitizing a set of records. (It's a nonprofit run by the LDS church, which is a behemoth in genealogy records.)
Couldn't upvote this enough. I have done significant genealogical research over the last 6 or 7 years, using primarily Ancestry and FamilySearch.org. FamilySearch, particularly for non U.S. records, offers access to an order of magnitude more resources than Ancestry, though not all of them are digitally indexed. Ancestry, with its larger budget, seems to have invested heavily in digitizing and making available a small subset of commonly used resources, resources that will enable more casual users to make quick progress. So records like the 1940 U.S. Census and state-based death certificates (usually up to 1960) are digitized, and thus made widely available to keep and draw new subscribers.
Read what I wrote and try again. I said nothing about which records were scanned or what they did with them after scanning. I merely spoke of the scanning itself which, buoyed by a profit motive, will be optimized for speed and efficiency, unlike a non profit.