I fully agree with the annoyance of these notifications. I just installed and activated your plugin. Why the heck would I want to buy the PRO version, rate the plugin or subscribe to your newsletter? I JUST INSTALLED AND ACTIVATED YOUR PLUGIN.
The PRO version or any paid extensions, etc...is spamming my admin box.
Also, the fact that your plugin automatically adds an admin widget on the admin dashboard is also wrong.

Yes, I know plugin and theme authors have created the plugins and themes I use on my WordPress websites. However, YOUR job is there because of a free product.

The only notification I am ok with is the Really Simple SSL, to turn that setting on.

I even remove all the "default" admint widgets, including that one that lists WordPress Meetups and WordCamps.

I install x amount of plugins in all my installations. Those the basic plugins I install. I install more depending on each website.

Guess what? I started with WordPress in 2005. I know how to install things. I know how to rate things. I already rated most of the plugins I use. I don't have to do that. I subscribe to over 30 WordPress based newsletters.

A former employee that was let go (not former at that time), decided to delete ALL 35 WordPress installations of mine. I had to reinstall everything from start (he had access to backups too and deleted them). Just like that person from Twitter that removed Trump's Twitter account on his last day.

WPSmush asked me 35 days to subscribe to their newsletter.

The list of basic plugins I installed in every installation (I just checked as I typed this sentence) is 41.

41 plugins x 35 websites...1,435 notifications if they each gave me 1 notification in all sites.

The whole anonymous stats collecting. Freemius and other ways.....that has to go too.