how Aker are approaching custody of their purchase, taking or giving?
Very likely the same way companies in the US do it, which would mean they use custodial wallets. The way they do it is of course wrong, but I think that public companies have no choice but to do just that way, not only because of the law, but also because they are not up to taking care of the crypto they bought.
This would come down to these companies using hardware wallets in combination with multisig, and yet it requires knowledge and is not something anyone can deal with. All of this suits governments best because BTC comes under their indirect control by accumulating under the supervision of various custodial services, which are nothing but crypto banks. In just ten years, we have gone from a digital currency that few has taken seriously, to being bought by the world's largest companies - I wonder what the whole thing will look like in another 10 years.