Why? Because most countries want control/power above all else. They're afraid people are going to use Bitcoin more than Fiat, effectively "stripping" them from such power. Bitcoin is decentralized, which means more power to the people. Therefore, it's in governments best interests to limit its dominance by regulating it or making it illegal. El Salvador was the only exception, because it's a developing country without a Fiat currency of its own (it relies on the USD). The rest will continue to introduce roadblocks (obstacles) to force people to use Fiat more thoroughly. There's nothing we can do to change this.

At least, BTC does its job well by being an alternative to Fiat. As long as you're able to obtain true financial freedom with it, nothing else matters.