Some mitigating factors to consider:
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A few years ago, The Friends of Bletchley Park almost went under for lack of sponsorship. They were probably so desperate they didn’t read the fine print on McAfee’s contract.
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As others have mentioned, while Snowden definitely has a place in cybersecurity and geopolitical history, it’s still a subject of debate as to what that place will be and what (if any) reforms to intelligence gathering will occur as a result. I’m not saying hold off until he dies or anything like that. But it’s been less than a year now, which isn’t really enough time to understand the impact of Snowden’s revelations in a way that can be presented in an exhibit.