Sicilian Defense: Pin Variation, 0-1

Sicilian Defence, Pin Variation: Based on Free GM Lecture

Sicilian Defense: The Chelyabinsk Variation

Sicilian Defense - ChessEasy

Why would White play 2.a3 as their 2nd move in the Sicilian Defense? It's not an accepted opening and I see no benefits. How would you go about strategizing a reply, as

Sicilian Defense: Pin Variation - Chess Openings

Queen Trap#1: Sicilian Defense, Pin Variation!

Chess Openings: Open Sicilian • Free Chess Videos •

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Short & Sweet: Cuenca's Kalashnikov Sicilian

How to slay the Sicilian Vol.3. - 2e6 and others