Thinking of switching stocks in Roth IRA to BTC etf. Do you really think the government will let us keep the capital gains tax free for this stock?

Title explains itself. Say we get btc ETFs in our roth IRA, then withdraw in the future when it grew a considerable sum. Don't you think the government will figure out a way or make some new rule where they can get some dibs on that too, just because they can?