Why are games like CSGO able to have 14 maps but Riot can't?

If you've never played CSGO, they have 14 maps plus maps for Operation passes and others. At times, they've been able to run well over 20+ maps with really only 2-3 having 10+ minute wait times. CSGO does this while having a lot less players than League. What is so special about CSGO that they can have all of these active maps while Riot is unable to keep up more than a few different maps/modes?
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