conclusion: this time it is different. you cannot compare the bull run of 2017 one-to-one with the situation today.
reason: if you look into the chart of the pre 2017 ATH you will recognize that after the burst of a mini bubble the low after was never lower than the high of the former mini bubble. but this time the low is lower than the pre high. that leads to pure panic in the market. you can called it manipulation of the market.
First line from below: ATH 2017
Second line from below: High of the first Mini Bubble
Third line from below: High of the second Mini Bubble
the Low of the second Mini Bubble is much lower than the High of the first Mini Bubble. the aim was to shake out the weak hands.
EDIT: updated with a pic.
EDIT2: second pic is the same as the first one but with a logarithmic scale. we have a long way to go in front of us until we will reach the next bear phase.
EDIT3: something to consider too: before the ATH 2017 there were no PRO tools like (regulated) Futures and Options available to trade with. the burst of the ATH Bubble of 2017 happened at the day of the start of the BTC Futures on CME.