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This can happen and will happen in a market that is Soo Bitcoin is the cream of the market and people who can't afford Bitcoin opt for the best possible alternative and against Bitcoin and losses lots of money.
That's why we should focus on investing in Bitcoin than the altcoins. Investing altcoins maybe 20% of all you fund will be allocated to altcoins is a good idea. Though, there are some altcoins that give potential when you are investing. Just like what happened to me back then year 2017. My investment in altcoin goes 3x from my initial capital.