So funny thing about that, assuming that the admins are just running the default Lemmy software.
There isn't one because there is not data being collected and or sent to third parties to speak of.
Here is the privacy policy: the only data the admins collect is whatever was in a text box when you pressed "send post" and your email address that you provided when you signed up. That... Is basically it. There are no tracking cookies, they don't track analytics data, like genuinely the only data that even hits their servers at all is just what you submit, manually.
The reason every website has a privacy policy is because they don't want to get sued for selling the data they collect on you.