Learn Farsi: چون کاربران مواظب بودند، هکرها شکست خوردند. - Because the users were careful, the hackers were defeated.

It is the passive version of the compound verb shekast dâdan (to defeat). By replacing the active light verb dâdan (to give) with khordan (to eat/suffer), the action flips. The hackers are not giving out a defeat; they are suffering one, which translates to the passive 'were defeated'.

Why is the plural ending -ân used for kârbarân but -hâ for haker-hâ?

Both are valid plural suffixes. -ân is mostly reserved for people and living things, often giving a slightly formal or written feel. -hâ is the universal plural suffix that can be used for anything. Since haker is a modern imported English word, it feels more natural to use the default -hâ.

Could I use zirâ instead of chon for 'because' in this sentence?

Yes, zirâ also means 'because' and would work perfectly here. The word chon is very common in everyday conversation and writing, while zirâ often sounds slightly more formal.

What kind of word is movâzeb?

It is an adjective meaning 'careful', 'cautious', or 'watchful'. Paired with budand, the simple past tense of 'to be' for the third-person plural, it simply means 'they were careful'.