What do you know about Google pop-up penalty?

Google goal to give best user experience and where user land on the page and that page have a content and images is not easily accessible by users on the transition after the user navigate on this page and this is not fallow the google algorithm guide lines that why google penalize the popup.

Right on schedule, this week Google began rolling out its intrusive mobile popup penalty, aimed at reducing the number of results that take mobile searchers to pages that use large popups or interstitials over the content they expected to find.

Google’s goal is to preserve the user experience of its searchers. When searchers click on a search result, they expect to be taken to a page where they can see the content that fulfills their search. Interstitials (pages displayed before the expected

Try to avoid below mention point and be safe from Google penalty:
Showing a popup that covers the main content, either immediately after the user navigates to a page from the search results, or while they are looking through the page.

Find info about pop-up penalty on Searchengineland or Searchenginejournal.

Pages where content is not easily accessible to a user on the transition from the mobile search results may not rank as highly. So Google penalties this type of pop – up window

Google penalize only those websites or webshop who does not follow google algorithm, while panda and penguin are the updates of google

No not always that type.
Google only penalise those web , not follow google Penguin algorithm

As far as I know Google penalize those qwebshop owners who use too big CTA buttons.