Are 3X ETFs safe?

I've been hearing a lot about 3X ETFs and their potential for significant returns, but I'm also concerned about the risks involved. Could you please elaborate on the safety of investing in 3X ETFs? Are they suitable for long-term portfolios, or are they more suitable for short-term trading? Additionally, how do they perform during market volatility? Is there a risk of losing a significant portion of my investment if the market turns bearish? Finally, what are some of the key factors I should consider before investing in 3X ETFs?