For most businesses that want visibility in AI answers, the trade-off favors allowing crawlers like GPTBot, ClaudeBot, and PerplexityBot in robots.txt — blocking them guarantees you can't be cited, since these models mostly answer from what they, or their search partners, have crawled and indexed. The exception is publishers whose entire business is the content itself, where training-data and traffic-cannibalization concerns can outweigh the visibility upside.
Kando's own site welcomes AI crawlers deliberately, on the logic that being unreachable is the one guaranteed way to lose every AI-search citation.