And you never paid anything to reddit either, still reddit wants you to spend your attention here.
Microsoft doesn't want to bring traffic to reddit. They have everything to lose when your attention is away from their services. For example you won't bring your friends to them. You won't watch their add while you are on reddit. You don't use a Microsoft platform when you are on reddit.
This is absolutely not a neutral choice for Microsoft: they want you, your attention, your friends and your content on their network. Why do you think they bought Minecraft in the first place? It's because it brings young customers in. Microsoft did not purchase Minecraft for the code (there are minecraft clones everywhere anyway), they bought the community. They want to pump their own numbers, not the competition's. If I remember correctly they also merged the Minecraft accounts with the Microsoft account, isn't it cute?
It's a constant war for your attention time. Your login is the metric, it's everything to them.
This is a war of content. u/spez also holds the contribution of his users in high regard, to the point where he is undeleting it. They both want our content, I don't see how you cannot make the link.
They probably have a monitoring tool watching content being edited. Do not make it too easy for the admin to restore your posts. You can use the python script that is posted around to change part of your posts, not all of them in one bunch, fill them with garbage like AI content (not just "deleted").
They have enough time to create these monitoring tools, but they have no time building a sane official app, go figure.
Of course reddit runs his own ones! It is their business to keep people scrolling. The real question is why would there be anyone else running the bots. To sell an account? You can get this with 3 posts in /awww... no need for spam bots.
I deleted all my content but I did it over the span of a few days, to let the different caches around reddit to update with the new void, and my content is still deleted (so far).
I said it before and I say it again: if you have the patience to do so then make sure you overwrite your content with chatgpt generated content, as the future AI that will feed on your post HATE feeding on already AI generated stuff. It makes the AI diverge.
edit: Filling your previous content with random generated content also make it harder to restore because it is harder to spot, compared with the comments which are simply "deleted". Also, if all of it is really true, congratulation to reddit for demonstrating to everyone and specially the USA how useful the GDPR is for the citizen.
Honestly the best move now is to overwrite all your comments with replies from chatgpt, since AI's hate feeding from other AI answers. It's like poisoning the well.
There are probably companies who specialize into fingerprinting and who will provide a module for reddit admins. Even the resolution of your screen or the firefox extensions you use can betray you.