When people see a blue ocean, they will inevitably sail into it... with good, and some not so good (but maybe intended to be good) intentions. This is a prime example of blatant advertising.

The plugin should be at least offering some sort of functionality options, not just adding a panel with an upsell. I can handle a plugin that adds functionality that I can actually use, and then some subtle upsells. But doing the exact opposite, no thanks!