> 1) limited supply [...] 2) no authority [...] 3) ease of access

But there must be something bad about it as well, right?

All your points are positively good things.

1- Limited supply prevents money printing and inflationary theft. Besides there are many coin alternatives and a BTC can be divided to a hundred million units.

2- No `central` authority is a big plus (probably the best property of it). Once crypto coin pass its infancy, the volatility will be much lower.

3-Ease of access. Another superb property.

1 - money printing is not crony capitalism like what bitcoin creators tout them to be. it is a method of stabilizing value. when used wrong it can destroy economy (venezuela, zimbabwe), but that is a question of politics (voting wrong people). bitcoin or crypto's decentralization is NOT a solution to this problem. also bitcoin is particularly problematic because it gained traction. value is simply sum of people's belief. when other coins gather enough followers then it will similarly be a problem, but not at the moment.

2 - this is false. if you know how currencies work you will know that this whole "decentralization" makes no sense. central authority is required for a currency because price needs to be stabilized. unlike what some people believe, bitcoin will not "self-stabilize" because currency stabilization has nothing to do with how many people use it. currency stabilization works by an authority dictating how much it should worth and manipulating market towards it. this is not some conspiracy, it is a protection provided for all currency users. not only bitcoin offer zero protection (completely exposed to vol risk), but also it is not really decentralized as 40% of entire bitcoin owned is owned by 1000 people only.

3 - yes, this is a good property. so there should be a state sponsored coin.

> either collapsing a global economy

Barely anyone uses bitcoin as a percentage of the world's total population, this isn't even remotely feasible today, or likely even in five years.

us economy is big so bitcoin feels like a noise right now. in other countries, it is a real threat. it's going to take some years until us feels the heat, but by then it will be too late.

I’m curious. How would it bring about global inflation since almost all of bitcoin is not really used for getting goods/services and people need to exchange real dollars/yen/etc to drive up its price? Doesn’t it actually suck out liquidity from other assets and drive down inflation of other assets?

bitcoin's price increase creates inflation because it makes holders wealthy. inflation is not a bad thing when driven by fundamental growth (value creation). bitcoin is not creating value.