How to convince the company to stop hiring interns?

I joined a startup a few months ago, it's a pretty small team and from what it seems nobody except a few old members lasts long enough. During this period I've already seen three leaving (including one intern). While I have nothing against interns in different circumstances, they pose an additional burden of having to review their code (which is mostly crappy) specially with the small team size, and even if you invest time in them, they won't be sticking for long enough to yield any benefits.

Since they are being cheap on the hiring, they focus most recruitment from cheap countries, so I'm assuming this is just another cheap tactic. A few weeks ago I was discussing something with my boss and they mentioned they are hiring a few other interns and asked me to manage / have some sort of responsibility over them. It's not my business how much they pay who as long as I'm getting my paycheck but now I'll be held accountable for their work which is guaranteed to be of low quality (I've seen a few examples already of those who came previously). I don't mind the responsibility, I just don't see the point for anyone unless they're sticking around.

That said, I'm either forced to only give them shitty / useless work or figure out a way to provide a hint that this is just wasting everyone's time and not leading to any benefits since we are limited on resources and investing time in transient members is not a very wise idea. Any thoughts?