That is because you're an idiot; and as an idiot you don't appreciate quality over quantity.
Raising the pitch requires increasing the frequency. The most common way of doing that is to speed up the sound. THAT is done by downsampling which removes recorded samples at given intervals; 2x faster and 2x higher pitch means removing 50% of the data recorded.
NOW, this also causes distortions because of aliasing due to being below the nyquist frequency. They cannot just record it at a higher sampling rate because they will NEED to downsample for distribution (which means MORE, not less, distortion). Oh, don't know what smart people words mean? Too bad, you're an idiot, go educate yourself, learn it wrong, and still remain an idiot.
What does all of this mean? They hired people who knew their DSP and didn't just use a "chipmunk program" as an idiot like you would.
Yes, there are other ways of doing this; you can mix it with a higher frequency sinusoid and filter out the lower band; this introduces other distortions (since it is additive frequency instead of multiplicative) and requires a rather sharp cut off for the lower frequency portion which can become quite noticeable as the "chimpmunk voices" do have low-frequency components which would also be cut off.
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