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Reddit: 'We Are in the Early Stages of Monetizing Our User Base'
(www.404media.co)
Memorial to "rif is fun for Reddit" Android app, aka "reddit is fun", shut down after June 30, 2023
Last I read, you delete your comments and they won't be publicly visible but Reddit still has them and still will sell them for monetization
That's why you edit them first.
As for mass deleting, that should have been done last year. You can't now.