In late December 2025, these previously free and open DL facilities became "Premium Access" features.
Good grief. And here I was thinking ACM had actually done a Good Thing with their move to Open Access. But looking at this, and considering also the hefty publication fees they charge for publishing said Open Access papers, it's hard to see anything positive about ACM right now. It's really making me question if I can justify continuing to maintain an ACM membership TBH.
Here's hoping enough pressure emerges to motivate a change on this.