And it is a fine pickle we jarred ourselves into. We thought it would be sweet but it just came out dill.
More than user-agent, because user-agent cannot be trusted.
Great! Well then... how?
HAProxy Edge is their product, and akin to Cloudflare and other competitors the heuristics to stifle bad actors is likely the secret sauce. Disclosing it would only lend bad actors the advantage in their game of cat and mouse.