I think csam is a direct object, with the subject being filters.
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What?! 😃 Human speech, Sir, not coding now.
Filters on coffee against csam = good
Filters in chicken soup against csam = bad
...is the equivalent. The focus is on the on the double standarts.
I'm not talking about code. I'm referring to parts of English (human or otherwise) usage.
https://www.perfect-english-grammar.com/subjects-and-objects.html