What are spam in js challenge | Firewall Rule

On this page:
https://developers.cloudflare.com/firewall/cf-firewall-rules/actions/

We can see that:
JS Challege is * Useful for ensuring that bots and spam cannot access the requested resource; browsers, however, are free to satisfy the challenge automatically.

Does anybody know what is spam specifically?

Edit:
By the way, what does js challege look like?

This topic was automatically closed 15 days after the last reply. New replies are no longer allowed.