Biker Business allows you to purchase biker businesses from the GTA Online Bikers update. You can buy them from one of the bandits (1 screenshot). From him, by the way, you can take transport from the same update.
Enterprises have their own missions to increase productivity and volume of goods. After the accumulation of goods, it can be sold or kept further to increase the price. At any time, the enterprise can be sold, but all property associated with it will be lost.
If the bandit does not appear in his place, you need to reload the scripts (Insert/Scroll Lock key by default).