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They wouldn't have needed a site. The tweet could have included the address and mentioned "first 10000 people to send X Bitcoin get the new Tesla Y"

Hosting for millions of visitors/hour isn't that hard. Maybe the cloud companies want to make you think otherwise, but a handful of bare metal servers around the world should be enough to handle that kind of load unless you're streaming video or running a really heavy web framework. Those can easily be obtained for free if you're already a criminal and have access to compromised servers or stolen credit cards to buy them with.

The point isn't tech scalability - the point is that scaling to that many visitors requires payment, and many cloud providers have anti-fraud mechanisms in place to prevent scammers from doing this quickly and easily without being traceable.

Compromised aws or similar accounts shouldn't be that hard for someone to get hold of at that point though?

You could probably make the whole site fairly convincing with just static files & some js which would be super easy to scale up with just a free cloudflare account or something along those lines