Microsoft has released the self-service purchase capabilities for Power Platform.PowerAppsPower Automate (previously flow)Power BI.Many of the tenants do not want this ability to be provided to users as they want to control it at organizational level. Earlier this was planned for last year but as many organizations requested the capability to disable it so it has been delayed till it is developed.Now Microsoft has released the Powershell module name MSCommerce, you can use it to disable this self-service purchase feature.
Install the module from Powershell gallery
Install-Module -Name MSCommerce
Follow the rest of the steps at Tech Wizards post.