Many years ago we used BizSpark, and we wasted far too many days and dollars trying to understand and use the licencing (and using the abysmal web interface that was mandatory). We couldn't end up jumping through the right hoops to use products in production, even though were target audience for the products when we started our business. The licences had very broad exceptions that gave Microsoft the right to pull the plug at any time.
I'm sure things are different now, but I'm also sure they are the same.
A SQL database on Azure runs about $5-$15 a month, depending on how you configure it.
Once you throw in SSL certs and DNS management, you're probably looking at about $100 a month.
https://azure.microsoft.com/en-us/pricing/details/sql-databa...
Basic will do quite a lot; I use one to load test our application and haven't hit limits.