For some of them I kind of lost access so I would need to write emails to instagram or whatever, for others I would need to remember and to access to each one of them and delete them.
The hardest would be gmail with people having my contacts from like 10 years ago…
Editing old posts doesn’t prevent them from being used for training AI data. It would prevent the data from being scraped, but Reddit, X, Meta, etc. are certainly storing all of your edits and training models on them, both internally and for third-parties who are paying for that data.