Hi @John
First in Azure you have a concept called "VM Scale sets" where the number of VM instances can automatically increase or decrease in response to demand or a defined schedule.
Refer : https://learn.microsoft.com/en-us/azure/virtual-machine-scale-sets/overview
Azure free account gives you $200 credit for first 30 days. After the 30 days and up to 12 months after sign-up, you can only use a limited quantity of some services—not all Azure services are free
Please refer to the below link and see what are the services which will be available for next 11 months and how you can avoid consumption.
https://learn.microsoft.com/en-us/azure/cost-management-billing/manage/create-free-services
https://learn.microsoft.com/en-us/azure/cost-management-billing/manage/avoid-charges-free-account
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Thanks,