Great question — answering as the UphillTech team:
If you are targeting the people who are using Arabic language, then yes, it would be good for SEO. If you are targeting other locations that aren't using Arabic language, that's a big no no for SEO. As simple as that.
Full answer by Josip Ivic: https://webmasters.stackexchange.com/a/86400 (CC BY-SA 3.0).
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