I think this is more applicable for training usecases. If you can get by with less than $30/mo in aws compute (quite expensive) then it likely does not make a didference.
What I mean is that you can rent out 4 3090 GPUs for much cheaper than renting an A100 on aws because you are not paying Nvidia's "cloud tax" on flops/$
I am guessing you mean at some point just buy your own 3090 as it will be cheaper than paying a cloud per second for a server-grade Nvidia setup.