Personally, I think tire planters are not pleasing to the eye, no matter how there are dressed up. But I would not be concerned about planting ornamentals in one.
Food? No thanks. There are enough concerns about offgassing and leaching to give me pause. I think there are better ways to contain the soil. My 2c.
I like them when used for ornamental cascading vines or plants, this way the tires get covered and you can stack them as high as you want. It also solves another issue if they get direct sun exposure, specially in hot climates or periods, cause the rubber can get extremely hot and damage the plant’s roots.
You may have just won ten million dollars! Or, maybe a tiny ad.
Quit your workee-job and live, year round, for free-ish in Montana