This is speculation so you won't get a definite answer. But I agree. I think the recent growth is caused by alts money flowing to BTC from people who want to get Segwit2X forked coin. I notice that the price always rising within days before the fork/snapshot and immediately going down after the fork. Coincidence? I don't think so.

But of course, that's not the only reason. There were rumors about China unbanning Bitcoin and Amazon to accept Bitcoin. Bitcoin is in a really good momentum right now.