No, GraphQl does not care about which DB you're using. It's just a query language, and it's your job to define the way you want to interact with the DB. To conclude, you can use whatever you like as DB.
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Does graphql not require you to host your database somewhere? Most guides don't seem to mention it and I can't find the answer
Yes it does, if you would like to see how to do that, I have a guide I've written. dev.to/fastflowz/generate-graphql-...
No, GraphQl does not care about which DB you're using. It's just a query language, and it's your job to define the way you want to interact with the DB. To conclude, you can use whatever you like as DB.