Of course it's not for that use !
The goal is to encrypt your files (as many as you want) and then sell it for others.
This prevent centralization in some ways and file deletion from online file hosting / or some plateform where you sell digital files.
How does this prevent file deletion?
It prevents only if you were selling something illegal, which....is NOT legal.
To be honest, it is something similar to e-commerce website selling digital goods like software or ebook. However, it can protect the files only up to level 1 and after decrypting, there is absolutely no way to restrict further sharing of such files. It's not the legal ransom but kind of utility to accept one-time licensing fee against the sold digital goods.
Yeah, if the first person decides to share it there is nothing you can do.
And with the speed google indexes stuff it will take less than 24 hours for people to find the decrypted files with a simple search.
Besides, if you want to collect multiple payments I assume you have to encrypt that file for each person, right?
Because once somebody pays all of them are decrypted....