Why are there so many bots?

In 2024, so many bots were everywhere, to the point where they would clog up someone's following. People often said that it was Elon Musk's doing (since he is the CEO) and have made several complaints about the bots. But, it has yet to be fixed and is one of the many reasons as to why people left Twitter and went to Bluesky during the mass exodus in November 2024 (after the USA election).

Example of bots clogging ones following:

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