Hey Justine!
Great question, as far as I understand, Google does NOT actually use “liking” reviews or marking them as “helpful” as any ranking factor. However, I believe it does use them to rank which reviews to show. Similar to how Yelp shows reviews.
In regards to your team, they shouldn’t have any problems if they decide to Ike the reviews. That being said, liking the reviews is just patting your client on the head, but not actually majorly affecting his rankings.
I suggest sharing that with him, he may not find it as important if he knows. On the flip side, if it makes him happy, your team shouldn’t have anything to worry about. I wouldn’t suggest liking every review simply because not every review is ”helpful” some might be truly more helpful than others,
I hope that answers your question!
Here is an article that shares a little bit of info: https://contractorcalls.com/7-things-didnt-know-google-reviews/ see point 6.
If that didn’t answer your question, Mozzer Miriam Ellis might have more insight.
Best,
Alex Ratynski