So I am a newbie and I always had this question in my mind why all altcoins are backed with BTC..
The altcoin isn't backed by bitcoin, you must know all market altcoin has pair of BTC. just look at coinmarketcap.
when bitcoin dump, altcoin would be dump and when bitcoin pump, altcoin would be dump either. After that, the altcoin will have the session (altcoin session). Holder altcoin should know the situation right now, this happens all time.