Marching With the Band

Why does Bitcoin seemingly move in unison with the Dow, Nasdaq, S&P 500? Has it always been this way? Maybe I just hadn’t noticed? Or, has the nature of Bitcoin changed? Is Bitcoin no longer the independent store of value it once was? I hope it still is.

Mods: I tried to post this in r/Bitcoin but they deleted it, saying this had already been posted. I am sure it has been asked and answered, likely there, here, or elsewhere. But, I looked and didn’t find it asked or answered. I would really like an answer to this question, so I hope the post is allowed here.