Formal (new businesses challenging established players, even indirectly such as competing for talent) and informal (personal and/or political nonconformity) challenges to these power structures are punished mercilessly.
This is less true in cities, because with greater scale (and broader power structures with more players,) small "threats" to the established order can emerge and incubate, or even be nurtured by large competitors (think VC) without being directly crushed.