to be specific: no, the WeTransfer ToS doesn't say they'll sell your stuff to AI people.

it has a bunch of completely regular ToS boilerplate and then says they may use your stuff as part of internal machine learning models used to identify illegal content, which is entirely normal and reasonable for a file host.

as usual it's just a company doing a regular legal language update and someone who doesn't know how to read ToS language has misinterpreted it as being nefarious.