*Drinks coffee*
I’m going to leave this review here and open for anyone that looks but here’s the thing: you are intentionally ignoring the link I posted as a reply above.
https://developer.www.ads-software.com/plugins/wordpress-org/detailed-plugin-guidelines/#6-software-as-a-service-is-permitted
Which has this text. I’ve highlighted the important part.
6. Software as a Service is permitted.
Plugins that act as an interface to some external third party service (e.g. a video hosting site) are allowed, even for paid services. The service itself must provide functionality of substance and be clearly documented in the readme file submitted with the plugin, preferably with a link to the service’s Terms of Use.
Services and functionality not allowed include:
- A service that exists for the sole purpose of validating licenses or keys while all functional aspects of the plugin are included locally is not permitted.
- Creation of a service by moving arbitrary code out of the plugin so that the service may falsely appear to provide supplemented functionality is prohibited.
- Storefronts that are not services. A plugin that acts only as a front-end for products to be purchased from external systems will not be accepted.
Just as with other 3rd party plugins that use other people’s servers for a service, this one does too. That makes it different.
If a plugin is a stand alone product or code, then yes. No link without opt-in from you, the admin of your site. Any plugin that does that is violating the plugin guidelines.
If the plugin is legitimately acting as an interface to other servers (not yours) for valid purposes then that makes it OK. Those links may be a condition of the service. That happens all the time.
If you don’t like that condition of that service then just stop using the plugin. It’s that simple.