As a community grows in size, necessarily the dynamic changes. A company where everyone knows every other individual and what they're working on will necessarily have different dynamics than a thousand-person company.

Whether this counts as being "ruined" will certainly depend. Having worked both at early stage startups and large tech companies, there are definitely trade-offs that come with size, and I can imagine some being attracted to one environment and not the other, but I think a lot of that is a matter of taste.