Anarchism isn’t a cohesive project (though most agree on some basic tenets) so it’s actually cool google gave that rather accurate response.

One reason I hear quite a bit is that most democratic political systems (theoretically at least) are designed so that voting gives a mandate to rulers. A sort of signal of consent and support of its actions. Here’s a paper on it if you’re bored and interested:
https://moscow.sci-hub.se/2959/c850720e581c4054f784bfdf2fdfadd6/bendix1976.pdf?download=true