I’ve been in similar situations, but details matter. If your scale up button is heavily abstracted services, your choice starts to become very different as the cost of reimplementing what the service does might be high enough that you end up with a no win situation of your own making.
The closer your “Scale up” button is referencing actual hardware, the less of a problem it is.
That's the next problem startups should avoid at all cost. Don't do heavily abstracted services, just put it all in a monolith which will make it faster and easier to iterate. Don't overthink it, just get the feature out of the door.
Chances are high that you won't get it right from the beginning, you can create these abstractions once you really understand the problem space with real world data.
When you get to that point I have another pro tip: Don't refactor, just rewrite it and put all your learnings into the v2.
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