Like reddit, you assume this is reddit’s data and not owned by the people who posted it. Each individual should choose for themselves if they want it there or not, full stop. Of course reddit has the right to re-post what you delete, so it’s just a never-ending arms race if it is that important to reddit to have that there. They cannot, however, ever claim that they own those words, images, video, or audio to the extent that they can ban you from sharing it elsewhere. Disclaimer: IANAL.
My recommendation is for anything that you put your own passion and time into that you self-host, or at least have the original copy somewhere. Then share that via URL whether it be on lemmy, reddit, your own blog, whatever. Social aggregators, IMO, shouldn’t be the source of any technical documentation whatsoever.