You'd have to get a fast mining rig or, more realistically, join a mining pool--a group of miners who combine their computing power and split the mined bitcoin. Mining pools are comparable to those Powerball clubs whose members buy lottery tickets en masse and agree to share any winnings. A disproportionately large number of blocks are mined by pools rather than by individual miners.
An official investigation into bitcoin traders was reported in May 2018. The U.S. Justice Department launched an investigation into possible price manipulation, including the techniques of spoofing and wash trades. Traders in the U.S., the U.K, South Korea, and possibly other countries are being investigated. Brett Redfearn, head of the U.S. Securities and Exchange Commission's Division of Trading and Markets, had identified several manipulation techniques of concern in March 2018.
Additionally, it’s hard to judge a Bitcoin faucet, especially if you are a newcomer. The author once participated in faucets. He recalls that when he started, they were giving out up to .002 BTC per request. Most faucets pay out once a week, but Freebitco.in seems to be the most legitimate one we can recommend. They apparently pay out once per week or whenever the user has reached a certain threshold. They have a whole system within the site, and a patient user with more time than money could conceivably earn some real cold, hard satoshi.
Ponzi schemes. Beware of anyone making promises that you can easily make incredibly high returns by getting in on the "ground floor" of a new phenomenon, especially if that person promises you little to no risk. You should also be on the lookout for any "investment opportunity" that does not have minimum investor qualifications, or that has complicated fee structures or strategies.
One obvious hurdle is the adoption of the technology. To deploy blockchain, financial institutions would essentially have to abandon their current networks and start anew. Trying to integrate the current payment networks with blockchain could prove exceptionally challenging -- to the point where some businesses don't even bother trying to do so. It's also still unclear, with the exception of bitcoin (CCY: BTC-USD), the world's most popular cryptocurrency, if any blockchain aside from bitcoin could survive being scaled to handle a lot of transactions.