Airless tyres for bikes are quite common (our kids bikes are all airless). Here are some grownups airless tyres! https://tannus.co.uk/tyres

There’ve been quite a few already. Most popular in bike sharing schemes, but they’re pretty awful https://link.medium.com/UrBG7Dkrzjb

You can buy airless inserts for bikes, as well as airless tires. These are not used in higher performance applications. In performance road, gravel, and mountain bikes you find tubeless tires that use sealant instead of airless inserts.