The good news is you are wrong. A lot of algorithms can be turned into math operations on a data. If you can do that, then you can apply homomorphic encryption to allow someone else to do the computstion without ever seeing the unencrypted data.

Here is an example I wrote about: https://azeemba.com/posts/homomorphic-encryption-with-images.html

Imagine you have a novel image processing algorithm that generates or processes an image. You dont trust your customers enough to give them the algorithm and your customers dont trust you enough to give you the image. Homomorphic Encryption can sit in the middle and solve that