Sounds similar to https://news.ycombinator.com/item?id=46203343 in terms, that Google decides who survives and who does not in business
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That's not to say I don't have gripes with how Google Maps works, but I just don't know why the other factors were not considered.
I just checked a few local restaurants to me in London that opened in the last few years, and the ratio of reviews is about 16:1 for google maps. It looks like stuff that’s been around longer has a much better ratio towards trip advisor though.
Almost certainly Instagram/tiktok are though. I know a few places which have been ruined by becoming TikTok tourist hotspots.