Not saying Jevon's Paradox wouldn't kick in, but the friction of convincing businesses to work on tools to allow their customers to spend _less_ money is high.
This is one of the fundamental things that make any sort of market work. If it's not safe to participate, people won't.
The real economic term for this is elastic demand (specifically, relatively elastic demand). For example, microprocessor cost reductions make new applications possible, thus demand increased so much that the total amount spent on microprocessors went up for decades. Example of inelastic demand is radial tires. They last four times as long as bias ply tires. But since this didn't cause people to drive four times further, the tire industry collapsed on the introduction of radial tires.
Does anyone know an example of an actual paradox? I've never found one, and I'm curious if they really exist.
My hypothesis is that they don't really have it nailed down but given big margins they have they can afford to let you use more resources than you pay for in the end.
[1] https://azure.microsoft.com/en-us/pricing/spending-limits/
There are a few Azure services to which the spending limit does not apply, but as long as you know what they are then you can choose to use them on your own volition.