PrivateBin

I see you already posted the story but if there is ever a problem with length you could use a PrivateBin instance, copying and pasting the text and sharing the link but people must hide their IP with a VPN to get privacy from the instance administrator.

There is an expiration date that can be set to the link.

"PrivateBin is a minimalist, open source online pastebin where the server has zero knowledge of stored data. Data is encrypted and decrypted in the browser using 256bit AES."

"As a user you have to trust the server administrator not to inject any malicious code."

https://privatebin.info/

List of instances:
https://privatebin.info/directory/