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The phrase "are harder for" is correct and usable in written English.
It can be used to indicate that something presents more difficulty for a particular subject or group.
Example: "These math problems are harder for students who struggle with algebra."
Alternatives: "more challenging for" or "more difficult for".
Dictionary
Exact(58)
But Azarenka's useful tennis qualities are harder for fans to embrace.
Now most foreclosures occur with prime loans, which are harder for banks to modify than subprime.
Those loans are harder for companies to sell, remember, because they lack that guarantee.
Such would-be jihadists are harder for the authorities to detect.
With all due respect to my mother and grandmother, things are harder for working parents now.
"The positives are harder for me to find than they would have been for Martin [O'Neill]," he said.
"These are harder for border police to identify and are usually resolved through tip-offs, for example by intelligence services".
But dance rehearsals are harder for the Bronx girl than they are for other children, because she has lupus.
By promoting cards the government hoped to boost consumption and curb cash payments, which are harder for the taxman to track.
But allegations of corruption are harder for the news media to ignore now, because of a huge groundswell of public anger.
Google is also building many of its own fiber-optic lines through which the data flows; if it controls them, they are harder for outsiders to tap.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com