@toby3d Build a proper website.
In the cases where some bots can cause issues significant enough to actually matter you have a variety of issues.
In the case of it sending spam through forms: You probably don't have any anti-spam to begin with, add it.
In the case of it clogging your logs: You probably don't filter out bots, do this.
In the case of it overloading your server: Your site is probably inefficient, optimize it.
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@toby3d I like to see bots as a benchmark.
If I get issues from 100 bots (which is already a pretty high number), your site probably wouldn't be able to handle 100 legitimate users either.