Old tires are good for raised beds.
Although there is a risk of chemical leaching and potential for the soil to become too hot when you use old tires for raised beds.
Generally though intact tires are safe for use as raised beds.
Old tires make great raised beds, for flowers or other plants that are not used as food.
Although it's advised to not use old tires for raised beds for plants that are used for food due to the possibility of chemical leaching.
But as long as the old tires are intact there is no appreciable risk in using the old tires in a vegetable garden.
Rubber tires do contain chemicals and heavy metals, although as long as the tires are intact the compounds will remain tightly bound in the actual rubber compound of the tires and won't leach into the soil.
I grow vegetables in old tires and have done so for many years and it's never been an issue.
My mom grows vegetables in old tires as well and has also done so for many years.