...the vulnerability of the BTC market...is not only caused by a lack of market size but also by the expectations of the market participants.
On the EUR/USD... Most orders will be very close to the current price, because... price is extremely unlikely to drop more than ~5% in a single day... People are expecting Bitcoin to rally and drop more heavily, so they set their orders accordingly, to benefit from these moves...this leads to thin order ...and to FOMO...trade with too high leverage ratios is also connected to that... people try to bet on big price swings...
Very accurate observation and we can experience this high volatility and price swings in the last days even more. This is true that many traders try to make money from this and there is even a name which is swing trading and BTC is just great for this. Exactly as described, I try to catch this volatile BTC price swings by myself, with high leverage because patterns like the Bart Simpson one are so common right now that it is hard to not use this knowledge to your advantage. Only in the last 3 days, I have seen a couple of 5% swings, so it is even more profitable to trade them, as to just be long or short.
Still, in my opinion, the forex markets are just much larger than BTC and that is why the volatility is lower. Additionally, these are currencies that are monitored and backed by governments and they do all that possible to make it stable and strong influencing the market in any possible way. This is the beauty of BTC that it is driven by different forces.