I finally bit the bullet and started paying for Acrobat, but the incredible number of mysterious background processes named things like "Creative Cloud Helper," "CCXProcess," "Core Sync," CCLibrary," "Adobe Desktop Service," and not one but 4 apps named "Core Sync Helper" are making me reconsider. They have worsened my battery life and I have security concerns about these ambiguously—named apps constantly dancing up and down my Activity Monitor. I refuse to believe they are necessary to view a PDF. I run MacOS Big Sur.