It would be fairly easy to set up a template of copypastas to highjack the top comment spot on rising posts with popular leftist ideas and maybe even edit to be more radical if it gets top spot
certain subs are good targets like r/politics, /lsc, /me_irl you get the idea
Can't you just check from another device/browser if the posts are showing up? I don't know how sophisticated shadowbans are.
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But redditors will believe any comment that is overly verbose.