We use EL (Specifically Rocky, a rebuild of Redhat) for this, but I strongly suspect that any of the main distros will be absolutely fine provided they have modern enough versions of the software you need.
Overwriting or editing a post will almost certainly just create a new revision of it in their database. All these tools work on the basis that doesn’t happen, but that deletion is a flag rather than a drop, which is pretty inconsistent. The reality in every large cms/forum software I’ve used is that revisions are the norm.
Reddit have the ability to keep all revisions of all posts made on their servers - they may even be legally required to do so. If a police agency requires evidence relation to a post on reddit linked to terrorism, they’re not going to be pleased if it is so easily eradicated. Some people think that GDPR gives them the absolute right for their data to be removed - but not if it conflicts with other laws and legal requirements, and even sometimes commercial interests (See “legitimate interest”)
Bottom line is - if you don’t want something to potentially exist forever, don’t post it on the internet and pass control of it to others.
I admin around three hundred linux servers and this is one of my most common tasks - although I use -shc as I like the total too, and don’t bother with less as it’s only the biggest files and dirs that I’m interested in and they show up last, so no need to scrollback.
When managing a lot of servers, the storage requirements when installing extra software is never trivial. (Although our storage does do very clever compression and it might recognise the duplication of the file even across many vm filesystems, I’m never quite sure that works as advertised on small files)