For a company selling simulators to end users, they use the pro or entertainment licenses for their sales.
The company itself must have a plugin package from xsimulator.net in order for them to be able to download plugins. But they in turn can make them available to their users.

However they decide to make them available, whether it be plugin packages or a custom SimTools build with game plugins (made by the 'unreleased but finished' SimTools Company Tools), the spot must be private for their users only. (A random user on the internet should not have access to these files.)

If you have bought the sim from a manufacturer that sold it to you with a entertainment license, you can probably also get your plugins or a prebuilt simtools package with plugins from the seller.

If the seller doesn't have a custom simtools build or any plugins, or if the sim is self built, then you will need a plugin package to have access to the plugin themselves.

In the end, these plugin download packages helps maintain the xsim community and insures that the plugin community keeps growing, which is good for everyone.

More info of how simtools and-xsimulator works its partnership can be found here:
https://www.xsimulator.net/community/threads/insights-into-simtools-and-xsimulator-partnership.9645/