Speaking as someone who has very little knowledge of ML, let's say I wanted to create a site like www.remove.bg and wanted to use this service to training my ow

Speaking as someone who has very little knowledge of ML, let's say I wanted to create a site like www.remove.bg and wanted to use this service to training my own models (from scratch). Is it feasible to do? How many hours ballpark would it take to train for something like this. How does it upload my training images to the target machine? I see the interruptible pricing for RTX3080 is $0.130/hr. Anybody with some ML experience calculate approx cost using this? P.S. I have no intention of creating a remove.bg clone, just curious if it can be done and if so how much approx it will costs.