It starves after 16-24 hours since u cant feed it. So why would you bother taming 1? Because they are walking bullet sponges and can damage metall structures. Excellent for raiding or transporting huge amounts of mats safely.
if your in mobile don't try to tame a titan near the ocean because the ai of the titan in ark mobile is dumb and can drown themselves so when you are taming a titan if it's near the ocean don't tame it it might have a chance to drown itself