About me: software developer who is into JavaScript and NodeJS and constantly working on one or another side project and/or open source. I have a blog at https://alex-rudenko.com
I am trying to implement precisely this pay per use model with my current project. And I also think this is the most crucial reason why FaaS is better suited for this model.
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Simplest thing with serverless (FaaS etc.) is a pay per use model. You pay for a function call, so do your users.
Other models (servers, containers) are better suited for monthly subscriptions, since you also pay them if they aren't used.
Best thing is of cause they pay you per month, you pay per use and they don't use it (often), haha.
I am trying to implement precisely this pay per use model with my current project. And I also think this is the most crucial reason why FaaS is better suited for this model.