Unfortunately for many, even in this day and age, there is not much choice. I main linux but also keep Windows on my PC as there are still tines when something will only work in Windows. Usually work related or gaming (VR in particular for me) and in fairness its increasingly rare.
Many other users aren’t motivated to change. For Microsoft, its a bit like boiling a frog - if you turn up the heat slowly the frog just puts up with it. That’s what Microsoft is doing to its customers - a slow constant enshittification, seeing what it can get away with. Try something and it causes outrage? Don’t worry, just undo it and just try again in a few years! Many are already used to no privacy and being sold as a commodity that they don’t even question it happening on their own personal computer.
It still helps damage reddit’s commercialisation of users because historic posts have gaps or disappear for new users. Editing posts and replacing with gobbledygook is probably more effective.
Also, its not clear reddit is able to retain deleted posts. They have a vast live site to maintain - why would they ever have been focused on having an immutable back up of all deleted posts? They may have snapshots to restore after short term issues but it does not follow that they keep snapshots going back in time. Perhaps they do or perhaps like many companies they do the bare minimum in favour of keep costs down?
I personally think its worth using sites that edit your posts and replace with garbage, as that is harder to separate out from true edits and helps pollute the data set for AI companies.