This (now defunct) link may help provide some background as to the origin of my question:
I've updated the post concerning limits with this info: https://community.playfab.com/questions/13455/limits-for-pro-tier.html. If you need higher limits, you'll need to contact the sales team to talk about an Enterprise contract (using the Contact link).
But I'd recommend trying out Azure Functions if you're not trying to ship right away, as that'll provide far more flexibility.
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