It gets old having a pop up every time I'm at a store or restaurant. I've done some searching, and the closest I can find is to turn Questions about Places off in Google Maps, but I have and it's still happening.
Make the entire world a better place for yourself and everyone around you when you turn off notifications that do not truly serve your intentions in your life. Simplify, becalm, re-JOYce.
1. Open "Settings" on your Android device.
2. Scroll down to Device > Notifications.
3. Scroll down to and select "Maps".
4. When it loads, touch/open the "gear" icon - it will open the settings for "Maps".
5. There, you may select from the plethora of notification settings for Google Maps. You will likely find more things to turn off (or on) there, but the one you seek was found on my phone at the top: "Questions about Places". You may also want to also toggle "off" several of the other requests for your contributions, e.g. "Adding your photos".
There are several others which I found equally intrusive as the insistence that you help others, rate your location, rate your restaurant, etc.
My own editorial justification:
So much of life's already pressing anxieties seem to me driven by such unnecessary complexities as this, like deleting incoming spam malware in the form of faux ads that click-bait you to go-to, buy-from, or unsubscribe-from and thereby more than likely infect your system with ransomware. (MALware + AD spam I refer to as "Malade-ware" or "maladyware").
Making life simpler at every turn allows Joy, Love, Power, to replace annoyance, which is ultimately low-level fear at its root, clinging to wanting things to be other than they are with the sense of powerlessness from the tech-world's bombardment of annoyances from everywhere; never ending, that we can't make the annoyance stop. No peace = no Joy = No true happiness. This is ultimately the killer of a mindset and "heartset" of peace and love which can only be truly experienced in the moment -- now -- and is constantly displaced by the low-level anger that such annoyances bring, and its root -- fear. Love and fear cannot coexist...they are opposites. One is anchored in past and future, the other in your true self when you are present.