Alipay is an escrow, Bitcoin is an attempt at a store of value, and hopefully a currency. The implications are way different, that's like apples and oranges. As someone said, you can build implement Alipay over Bitcoin. What you have to compare is Bitcoins to Yuans.
bitcoin also probably doesn't change as much politically or operationally as people often think. as another example, to say 'inflation is theft and bitcoin prevents inflation' is too simplistic, for nobody is required to hold 'fiat currency' long-term even now. (even being required to pay taxes in it does not meaningfully coerce one into suffering the effects of inflation; indeed, monotonic inflation helps those who store value elsewhere and convert it to 'fiat currency' on the date taxes are due.) what bitcoin adds, specifically, is just decentralization of a single currency instrument. the practical advantages (and disadvantages) of that long-term have yet to be seen.
I think you omit a point: It is true that one isn't forced hold fiat, but several circumstances work against that. The first one is chronic poor investment. The grand majority of wealth is denominated in fiat, salaries are paid in fiat, dividends are paid in fiat, stocks are traded in fiat. The need to constantly convert increasing amount of fiat injected into the economy, and the fact that fiat forces you to invest, ends up in people investing it poorly, which in itself is detrimental to the economy as a whole.
Next, none of the alternatives to store your value outside of fiat currency is in itself a currency. Not to mention that those alternatives are kept under close watch by the state, like stocks or real estate. Only gold somehow gets away from that surveillance, but it isn't a currency either, and unlike stocks, it isn't electronic. Bitcoin isn't a currency yet, but it holds that potential and is on an electronic support already.
Lastly, whether you like it or not, you have to go through fiat in your daily transactions. The implication is that, since fiat is controlled by the government, it gives too much power to that government, power that a mere store of value cannot take away. On the other hand, a whole new currency that effectively isolates portions of the economy from the government's reach will have a sensible effect on the economy. That's for the political part. But we're not there yet.
