ANSWER:

Because they follow the sunnah of the prophet salla Allahu alaihi wa sallam and pray it as he had prayed it. 

I want to ask why people in Saudi Arabia perform Asr prayer very early?

Prayer | March 10, 2022 10:39 pm
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Is it permissible for men to pray a jamaah in the masjid before the main one, provided that the time for prayer has begun?