I originally tried to do this on my own server but my GPU is too old :(

Slammed an A380 in my old server that doesn't even have a GPU power connector & it works pretty well for stuff that will fit on it. They're only like, $150 brand new nowadays; could be a decent option.

I think in this case "your own" means under your control, rather than a service or license you pay for. "your own" as in ownership of artefacts, not as in being the creator.

<insert a random "i made this" meme>

And then call it serverless

Not sure what "baking your own bread" means if you are using wheat grown by someone else in an oven that you didn't build that is run with electricity you didn't created from your muscles' force. You haven't even contributed to the nuclear fusion which created the oxygen for the water molecules you've been using! How dare you, standing of the shoulders of giants!

This is more like buying a loaf of bread from the store and saying you baked it yourself. They did nothing even close to making an OCR engine.

Is it "building your own oven" if you go to Lowe's, buy an oven, and installed it yourself? You've done some work, but your integrating a pre-built appliance into your kitchen, not built your own oven

The title is "rolling your own", not "building your own"

why are chefs baking bread? there's buildings to construct

Consider the source of the idiom: rolling your own cigarettes.

Which involves taking some rolling papers, a pouch of loose tobacco (or whatever), and perhaps a little device if you're rich. As opposed to manufactured cigarettes, you're just doing some manual assembly for the end-product.

You don't need to cultivate the plants or pulp any trees to roll your own.

It means "one that is yours" in the same way "running your own plex server" does not imply starting with building a silicon fab.