Everything that suddenly pumped significantly in a short time is a bubble, including bitcoin when it reached $20,000 and then pops up to $11,000. Look at the current price at $10K, barely can't pass the $12K wall. Hence, it's better if bitcoin price increases slowly but steady.
lol no, thats not the real definition of a bubble because what i heard is that a bubble is something that pops out and dissapear in thin air without a trace. pumping of a coin is pretty normal and that is due to the more demand that it gets from the public as well as market manipulation by whales. dumping of the price is also normal as it always happen in the case of crypro curency and that is also due to the lesser demand as well as manipulation. overall i do agree that we are now closer to the bubble because bitcoin is still continue to decrease from hero going to zero.
If we compare this year's current price with the price when we still on the early of 2017, we still above, I only consider bubble when an assets increasing so significantly and when it pops, it's gone, or at least, have lower value than or back to the beginning price. as you said, price dumping is really normal and this cycle always happening in the early months of every year. It's been proven and someone even have written an article regarding the pump and dump cycle. What makes this year looks different is because the mass adoption has increased significantly and there's so many newcomers who always scream even when bitcoin just drops about $1.