"rsync for cloud storage" - Google Drive, S3, Dropbox, Backblaze B2, One Drive, Swift, Hubic, Wasabi, Google Cloud Storage, Yandex Files
Backblaze B2 lets you upload to a public or private bucket and generate convenient links (including with an authorization code if it's a private bucket and an expiration for that code). You can also upload either directly from the web interface or using something like rclone. Apparently B2 also has some server-side encryption stuff (including with a client-managed key?), but I've never tried it and rely fully on GPG encryption before uploading.
:mailbox_with_mail: Easily and securely share files from the command line. A fully featured Firefox Send client.
There are firefox send forks out there such as https://github.com/timvisee/ffsend
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