Taking the services entirely offline then giving them a few weeks to access archived data does not entirely cover the definition of (at least in my opinion):

> not without giving the other party ample time to make other arrangements

Going entirely offline like that can easily destroy a web business. Or at a minimum seriously harm them.

Not to say I care much for Parler's technical nor administrative approach to providing free speech.

Parler ignored repeated notices of TOS violations from Amazon, were given a chance to address their frequent TOS violations and incomplete enforcement of TOS violation notices, and came back with a very weak plan while still ignoring specific TOS violations AWS had notified them of.

Parler had ample time. They ignored warnings, they did not address their TOS violations. Then their contract was terminated, and AWS is helping them migrate after the fact. Parler displayed an ignorance of the law and how web hosting works.

Web companies that repeatedly violate the TOS of their hosts deserve to be at the mercy of their failover plans. That responsibility is borne by the web company, not the host.

Why aren't you hosting them?

Because they're not Amazon.