Which hosting provider does QB Online use?

Hello Marcus_DPDHL, 

Welcome to the Community page, 

I would suggest you have a look at this link the developers would be able to tell you more about this. 

@Marcus_DPDHL 

Afaik, they are still partnering with AWS

https://aws.amazon.com/solutions/case-studies/intuit-cloud-migration/

If you have to open a new QBO account, make sure to click the Buy button to get the discounted price for up to a few months. If you purchase from the Trial account, you have to pay the regular rate.

https://quickbooks.grsm.io/UK