For the last two years or so they tried to retire "Simple Gallery" (which already had no ads or extra permissions required) and move people to its paid version by releasing updates with nag screens and fewer and fewer functions (edit: removals).
Every single time someone complained in a review, they would reply a canned answer: "Hey, there are many improvements in the Pro app version, it is definitely worth upgrading".
I have no issue paying for apps I like, but sorry, I won't reward scummy behaviour.