Them using land is not the only thing they do.

They drink water for example, a kg of cow meat requires 1000L of water. This is not a problem everywhere, but it can be.

They eat grass and there are many places where they have the space and the climate to walk around and eat the grass that is there, but many places they need additional food. Their biggest source of protein is usually soy. Most of that soy comes from south-america: first they burn down a forest to make space, then they plant genetically modified soy. This soy is modified to be resistant to pesticides. They spray the entire plot with these chemicals, so everything dies except the soy. This stuff travels beyond the borders of the farmers land, killing local wildlife and threatening the ecosystem.

Also not all cows are treated well. A cow only gives milk after birth, so each year a cow has to be insimenated and birth a baby cow. A cow can live for decades, but their body is working so hard many won't live over 10 years.

Another problem is that cows are given hormones and antibiotics, residues of which end up in consumer meat.

I'm not writing this because I believe we should go to a 100% plant-based society, but the current system of mass-production is a lose-lose situation for everyone except for the people making a (small) profit.