There is. Just go long BTC and wait years. Free money doesn't say anything about the interest rate. (And optionally loan BTC at roughly 30% per annum return denominated in BTC at bitfinex so others can sell your BTC short)
Or the alternative is sell BTC and wait some months.
Also "free money" doesn't speak to the risk involved, e.g. the risk of being long BTC for years (your life priorities and needs change while BTC is < $100 for example) or the risk of borrowing BTC to sell short. Even doing nothing, breathing or driving in a car has risk.
Your timing and risk profile determines your choice amongst those options. For me, the optimum choice was to sell BTC for dollars at $300+. Because I need to expend the dollars over the next months on mathematicians and programmers. And I can't tolerate a drop in the dollar value, because my near-term expenses are in dollars. Also my upside is on R&D and not expending my time watching my short positions. And return of dollars is more crucial to me than riskier capital gains on dollars, because my upside is much greater on R&D with much less risk vs. reward, than on speculate investing. Others have different situations thus a different choice to make.
The interest rates have turned (as of yesterday in shocking development which has been predicted since the 1980s) which implies collapsing global liquidity, thus you don't stand a chance in hell of being correct against me and Armstrong's supercomputer with $1 billion of historical data pattern matched for periodic patterns.
inca I am not retired and when I replace Bitcoin, you can go hide under a rock.
inca, I suggest you view a volatility chart of which the recent pattern low was how in May we called for the rise to $315 (long-term trend line, now headed to $320) as well as the seasonality factor for gold which was pointed out by Armstrong.