Some of them just stopped going to Youtube altogether. I believe being inactive long enough causes Youtube to eventually drop you, and of course, without you, that's one less subscriber on the list of all the people you subscribed to.
Hmm... I don't think that's happening to me, but it seems to be happening to a lot of others. It is a possibility that some of them actually are bots and inactive channels, because otherwise why would YouTube feel the need to delete them from your channel?
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