Millions of small sites and creators don’t have the ability to design their own protections against large scale automated access. If useful content now attracts aggressive crawler traffic, many sites will be too expensive or unreliable to run.
Is part of the answer a community response? Perhaps a community-maintained toolkit, based on traffic data, that host sites can apply? It could include standard agent identification, rate limiting, traffic classification, access policies, caching, challenge mechanisms, logging, attribution and usage control etc etc.
In effect, we need much stronger road rules for today’s automated traffic, available as open technical patterns and libraries rather than every site owner having to invent this alone (they won’t).