There's 3 reason people say Bitcoin is in a bubble.
They really think that and have no clue of what a bubble is.
They don't have the guts to get in and they're jealous and trying to hold you back.
They're trying to sell you some useless coin, token, investment service or other scam.
When a business' outgo is more than their income - it's a bubble.
Bitcoin does not have an office building, an organization, nor a centralized group of people determining its value, a bank, a Wall Street or anything thing else that makes their living by ripping off the public. Your money is also not being lent to people who are too incompetent to have any job skills.
The Bitcoin ledger is balanced every 10 minutes.
If every Bitcoin-holder cashed out today they would all get 100% of their invested money and capital gains.... because no one is spending their money on buildings, staff and #2 pencils.
The bank, my friend....., is YOU.
While Bitcoin increased in value by 1,000% in the past 12 months..... there was a major, natural adjustment in the market in July, in September and again in early November....
These normal adjustments were not due to your money being mismanaged - they were due to people cashing out their profit.
If Bitcoin has a super-rise in a short time... you will ALWAYS see a fast adjustment and you will ALWAYS see a buy-back because everyone loves to gobble up bargain prices.
Idiots and scammers have been saying Bitcoin is in a bubble since it reached $30.
If you don't know what the hell a bubble is - I highly recommend shutting the fuck up, because you're making an ass of yourself while the real investors are laughing at you.