Why some coins have trillions of supply instead of in few billions?

So I have been wondering that why do some coins have trillions of tokens instead of just a few billion? For example, SHIB has a supply of 589.26 trillion, which results in a price with many zeros, like 0.000000176. If its supply were limited to a few billion, its price could be 0.01 or 0.001, making it easier to read and remember. Is there a technical reason behind creating trillions of tokens? Does it serve a specific functional purpose, or is it purely a strategic decision for marketing or accessibility? I’d love to understand the rationale behind choosing such massive token supplies.