1. it's easy to get WebDAV running, most of HTTP server support it through modules. or you could run it with rclone, on non-standard port or behind a reverse proxy
2. I don't share upload access with others, it's only for my own use. and this way I don't need to deal with huge uploads or illegal contents.
3. I could also just curl it, the uploaded content will have proper mime types. It's convenient for me to share pictures and videos this way on Telegram because it generate previews for me, and it's easy to just copy-paste a link to send to more than one person.
curl https://user:password@domain.tld:port/path/to/file.png -T file.png
Could write a simple shell script to include random characters in the URL, copy url to clipboard etc, such like this one I wrote [1]
btw for plain text, I prefer to use fiche [2] a simple netcat based pastebin. I have a public fiche instance [3] which allow people to upload with bash/zsh/netcat and show webpage with syntax highlighting. Text usually consume very a few of storage and not that "sensitive" like some photos and videos could be, so it's less troublesome to provide a public service for that. I've also write a Telegram bot for easily upload to my pastebin.
Lifespan of my WebDAV uploads and pastes are 1 month, it's very easy to clean them with crontab
@daily find ~/webdav/tmp -mindepth 1 -maxdepth 1 -type f -ctime +30 -delete