Google have big business ecosystem and any policy change potentially can affect their business. It is not harmful if they don't accept cryptocurrency because they still can earn money from other products.
If they accept cryptocurrency while legal status is unclear, their business will have potential damage.
Similarly to Google, I believe some big audit companies will soon join cryptocurrency market. The Bitcoin Spot ETF approvals from SEC. are like unofficial announcement that the legal environment for cryptocurrency now has become more friendly and legally in the USA. Top 4 Audit companies will not refuse chances to join this potential industry if they see risk is already eliminated legally.
I have to say it has to be a slow process as well because they have probably a billion lawyers as well, so that means they will have to go through legal system to make sure that everything they are doing would be based on the book. They can't afford to do anything that could be considered even a potential of case, they have to make it all legal one by one without any single shred of doubt left.
This means, it will take time for lawyers to go through the system and the changes and approve or reject these before they could make the changes. This is why it's important that we take the win on this one, it's a good thing because they have spent some good time checking these out and they are adding it meaning they found nothing wrong with it.