It is caused about decentralized idea. The goverments cant control emission of cryptocurrency and ignore the main advantages of if it like transparency and fast transactions. But many big companies are looking to blockchain sector and invest in attractive ICO projects. I prefer to invest my money in Kelvin Blockchain. Kelvin Blockchain is very flexible and adaptive, which makes it a perfect choice for implementation of the new blockchain projects and platforms. If you want to understand this issue, then this is a good example of a far-reaching idea.
I think 2018 is the year of privacy and the public has shifted in that direction. I do not like recommending coins but Monero is standard and it's time to buy because the price goes down too. Dash, ZCash, Verge are also private but do your research because Dash is not really decentralized.
I think the bitcoin power is over now because the technology is outdated and does not provide privacy to protect you. Also, you can not rely on public exchanges because they can be arranged. I suggest you do some research. Look into decentralized exchanges (such as bisq) and look for some crypto currencies that provide true privacy.