To simply answer your question, don't count on it, unless something very dramatic occurs to make desktop use of Linux even begin to approach usage of Windows or even MacOS!
Adobe never committed to providing a version of any of its applications in perpetuity for any particular operating system or version thereof and providing support for same. Decisons as to which operating systems and versions of same to support are based on an analysis of potential returns on investment. The “free” Adobe Acrobat Reader is provided as an “entry point” for licensing other products such as Acrobat Standard (Windows), Acrobat Pro, and various add-on services on iOS and Android (Android is not Linux). Quite frankly, there was simply not enough interest in Adobe Reader, Acrobat or any other Adobe document or graphic arts applications under Linux where many if not most users expect applications to be “free” or at a much lower price point than for Windows and MacOS. There are considerable costs involved for a “free” reader product including not only development, but testing and especially support; in the case of Linux, this includes the multiple versions and distributions of same.
Don't make assumptions about what type of servers Adobe is using for internal purposes. Hint: for many if not most of our web-based PDF services services, we are certainly not using Linux.
Note that these communities are not a direct access to Adobe's product groups. If you want to make a formal request for Acrobat products (Reader or otherwise), make such a request at Acrobat UserVoice.
- Dov Isaacs, former Adobe Principal Scientist (April 30, 1990 - May 30, 2021)