While I understand your point of view (though I believe patents that last for a couple decades wouldn’t have ruined mathematics), the strongest point, at least to me, of the argument you’re responding to, was drugs.

Drugs, according to the comment, are like an algorithm, with a simple set of inputs— hard to discover these inputs, but then easy to replicate. Yet we seem to feel differently about patenting drugs?

Do you have a response to that part?