Shutting down Bitcoin is next to impossible unless they have control over the entire internet and all the hardware, but they can surely come up with ring fencing and deny providing banking services to prevent people from exclusively buying into Bitcoin and other cryptos, but again, there are workarounds for every problem that is created :)
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And if more people are acquiring crypto through rewards, then the need to "buy" Bitcoin or any other crypto currency using the banking system is diminished.
That is why I think it so important to get as many people holding as much crypto as we can. This way, if there is any lockdown of the banking system, say, there are alternatives.
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