What resources are you concerned about? An n100 minipc should be capable of serving something like a blog at 20k+ requests/second (or saturating its network).
Sure. But 25,000 (bot hits / day) x 50kB (static webpage) = 1.25 GB / day / page x 30 (days) = 37.5 GB of data transfer / month / page. And that's assuming a static resource - if any of the resource is dynamically generated by the server, there's a CPU and memory cost too. Overall, even if you treat the impact on the server as "negligible", it's still an unnecessary waste of resource was the point I was trying to convey.
Here's a more real-world projection of the cost and server impact - The Bandwidth Cost of AI Crawlers: What Scraping Really Costs Publishers - https://aipaypercrawl.com/articles/ai-crawler-bandwidth-cost