why did arnold schwarzenegger unfollowed alot of people on twitter?

It sometimes really depends on who is running his account or if he is running it on his own, sometimes people follow a lot of people to gain more followers. I had a person follow me who had 300k but followed 200k of accounts, and would randomly unfollow all those people. I think it sometimes has to do with gaining more followers, if you follow someone especially if you have a verified sticker they might follow you back, and then you delete everyone they're following to make them look important, or make them look as they got a lot followers

His manager and agent could be running that account and following people to boost up people to follow him, or maybe Arnold is being friendly and wanting to follow everyone.

I also seen a celebrity who would follow their fans back (the celebrity did the following on their own) and they had maybe like 500k and followed maybe followed 24k people for example. One day they decided to unfollow everyone due to reasonings of feeling as if some of their fans were not as loyal as they may seem (due to twitter drama and rude comments). So they unfollowed everyone, and only followed famous people, until a little bit later only followed a couple fans.

I mean there could be many reasons as why he changed if following, he or his manager/agents might have followed people to get more people to follow him. As well or maybe he followed them on his own, and thought he was following too many people and decided to cut down on it. I also think maybe there was a following limit and decided to unfollow, people he didn't feel like he wanted to follow them anymore

Because following alot of people isnt cool