Wetransfer is a service that I've used in the past to get big files from a machine to another machine.
Nowadays I would just copy a file to my iCloud and send a like to the file via email, but I guess that is too difficult for a lot of folks. So WeTrasfer will be used by many for a while to come.
That is too bad, since they now claim that all files send via them are now theirs to use. They claim this right in the new Terms Of Service that you have to agree on to continue using them.
This means that any file your send via them can and probably will be used to train Large Language Models with.
See also thus BlueSky post: https://bsky.app/profile/ramiismail.com/post/3ltxlpy5qyc2h