To be honest, you have to look it the other way: if you pick any (!) number from 0 to 100 or from 0 to 10 or from 0 to 1 etc , randomly (!), chances are 100% (not 99.9%, not 99.99999999999%, but 100%) that the decimal expansion of that random number is infinite. The number of numbers were finite decimal expansion is so little compared to all numbers, your question like asking: “why is not every particle in the universe a sand grain of a certain color?” times infinity.
The fact that we humans learn about numbers with finite decimal before we learn about any other numbers, is frankly kind of random.
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