Add criteria for pastebin services (#2165)

docs/productivity.md

@@ -153,3 +153,24 @@ In general, we define office suites as applications which could reasonably act a
     [:octicons-server-16:](https://privatebin.info/directory/){ .card-link title="Public Instances"}
     [:octicons-info-16:](https://github.com/PrivateBin/PrivateBin/wiki/FAQ){ .card-link title=Documentation}
     [:octicons-code-16:](https://github.com/PrivateBin/PrivateBin){ .card-link title="Source Code" }
+
+### Criteria
+
+**Please note we are not affiliated with any of the projects we recommend.** In addition to [our standard criteria](about/criteria.md), we have developed a clear set of requirements to allow us to provide objective recommendations. We suggest you familiarize yourself with this list before choosing to use a project, and conduct your own research to ensure it's the right choice for you.
+
+!!! example "This section is new"
+
+    We are working on establishing defined criteria for every section of our site, and this may be subject to change. If you have any questions about our criteria, please [ask on our forum](https://discuss.privacyguides.net/latest) and don't assume we didn't consider something when making our recommendations if it is not listed here. There are many factors considered and discussed when we recommend a project, and documenting every single one is a work-in-progress.
+
+#### Minimum Requirements
+
+- Must be open-source.
+- Must implement "zero-trust" end-to-end encryption.
+- Must support password-protected files.
+
+
+#### Best-Case
+
+Our best-case criteria represents what we would like to see from the perfect project in this category. Our recommendations may not include any or all of this functionality, but those which do may rank higher than others on this page.
+
+- Should have a published audit from a reputable, independent third-party.