redact dot dev is owned by a guy named Dan Saltman. Dan Saltman is the cohost to liberal youtuber Destiny (Steven Bonnell). Dan Saltman is openly Zionist and has tried to have all anti-Zionists banned from streaming websites, such as twitch. I would avoid using redactdev. I don't trust them to securely delete things.

My rule of thumb: never trust a service whose front page has a "Pricing" tab.

There are grease monkey scripts which should still function on the old.reddit site, even though they haven't been updated for a long time.

It can be done fairly easily. It's literally just using the API of these services. I might try to do this while I am learning how to use Tauri in Rust.

Interesting tool ! Indeed, thats quiet shady to give ALL your accounts informations to a closed source app...

And alternativeto has no real alternative, rn, but let's hope something exists doing the same

I got a little rust program to replace all my discord messages with quotes from the uncyclopedia.

I don't know of FOSS "one-stop-shops" but these services should have APIs you can use and write scripts to mass-delete. It wouldn't be particularly hard or time-consuming, and you can also publish your scripts so other people can use them instead of writing your own.