This statement is completely NOT true. There are risks with any investment, including bitcoin based on the asset itself and then perhaps based on various ways that normies might execute whatever are their investment techniques.
Also profits are not guaranteed, and the emotions of people vary, so there are people who have lost money in bitcoin, even though bitcoin has historically been an asymmetric bet to the upside, but some people are not able to deal with BTC price volatility so they buy higher than the price that they end up selling.
It is true that in any investment there are risks of losses. Risks of loss also exist in Bitcoin. Full return on any investment cannot be guaranteed, but in my opinion Bitcoin investment is considered the most reliable crypto currency. Investing in it has minimal risk of loss compared to other crypto currencies in the market. It is also true that there are people who have lost their money in Bitcoin. Investing in Bitcoin does not necessarily mean that you will make a profit every time you invest in Bitcoin. Only entry at right time can give us profit. An entry made in any coin at the wrong time always leads to loss. However, among all crypto currencies, Bitcoin is the best choice for long-term investment.