This is a service for audio developers making plugins.
As an audio dev, you want your effect and instrument plugins to work on all DAWs and all platforms you support.
That turns out to be a tall order! Manually QAing each platform isn't time effective or reliable. Waiting for users to tell you which DAWs your plugin has trouble with is also a bad strategy.
Validation, on the other hand, bubbles potential issues up immediately. It ensures your plugin conforms to the VST3 and Audio Unit spec and can handle unexpected inputs and edge cases.
This service gives you a taste of what validation looks like. If you find it valuable, running pluginval in your CI pipeline is the most reliable way to ensure ongoing compatibility and reliability — freeing you up to worry about the actual hard stuff (like UI!).