Bot accounts look like regular accounts until you start looking for them. This allows them to inflate their user numbers and makes them a more appealing platform for advertisers. This means that they make more money selling ads, creating a perverse incentive. If they got good at finding and removing bot accounts, their user numbers would probably massively fall, costing a significant amount of ad revenue in addition to the developer costs to create the bot-find algorithms.
Remember, companies existing solely to generate profit. When they offer a free service, you become the product they are selling. Either they sell your personal data, or they charge advertisers for access to you.
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