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I'd bet "being on the Rails stack" would carry little weight if they were deciding to acquire them.

Software stack is actually a pretty big decider.

php was pretty much a dealbreaker for google acquisition years ago. It pretty much means google might be happy to buy shares in the company as an investment, but won't buy the whole company and plan to integrate it into their own offering.

Github was a rails platform and google was interested in buying them.

Why? I can't imagine a corporation the size of Google would decide to not buy a company, purely based on what language/framework it uses, assuming that buying the company otherwise makes business sense.

Google bought Crashlytics/Fabric from Twitter and that is (was?) a product based on the Rails stack