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This domain is hosted on Google's own network, which might sound reassuring, but it also blocks all search engine crawlers via robots.txt and accepts outdated TLS versions that most browsers have stopped supporting. Combined with zero history in the Wayback Machine, the evidence points to a throwaway or misconfigured subdomain rather than a real service.
If you're wondering 'is r5---sn-aigzrn7e.c.2mdn.net a scam', the answer is less about scam tactics and more about the fact that there's nothing here to engage with. There are no r5---sn-aigzrn7e.c.2mdn.net reviews because the site has never been a public-facing business. The safest move is to treat it as untrustworthy and move on.