Shareboxed
Most file sharing on a Mac still happens the way it did fifteen years ago: an attachment on an email, or a link to a folder that stays open forever. Both leave a copy somewhere you no longer control, and neither tells you who opened it.
There are three things worth insisting on, and they cost nothing:
Encrypt before it leaves the Mac
A file that is encrypted on your machine, with a key that never reaches the service carrying it, cannot be read by that service: not by a support engineer, not by a subpoena, not by whoever ends up with the backups. That is the difference between "we promise not to look" and "we cannot look".
Shareboxed encrypts every file on your Mac before a byte is uploaded, and the
key travels in the part of the link after the #, which browsers never send to
a server.
Give the link an end
A link that never expires gets forwarded, pasted into a ticket, and indexed. Shareboxed shares stop working after seven days (a hosted share can be set to anything up to thirty), and optionally after a number of downloads you set, whichever comes first. Files and the metadata around them are removed afterwards.
Add a password when the link is not the secret
A link is a secret in itself, but it travels through channels you do not control. A password on the share means someone who intercepts the link still has nothing: the password is what unwraps the key, and it is never stored on our side. Shareboxed can also generate one for every share you make, with a single switch in the settings; the password is copied along with the link, so sharing stays one paste.
None of this is exotic. It is the default in Shareboxed because these three things together are what make a share you can forget about.