No, it's not, it's just a rumor. You only can get below 10% of your investment. Just try to do short-term trading with bitcoin. You will feel it your own it's big but not big enough. If you investing with a lot of amounts bigger profit you will get.
In 2017 bitcoin has increased dramatically and helped wise investors become millionaires within a year and what they needed to do was just buy bitcoin and keep it within a year. The current investment in bitcoin and crypto is a global trend and therefore it will certainly grow strongly in the near future. I believe this.