At least in the US they grow fast growing trees that are only good for paper pulp[1] —they’re not good for furniture or construction frames (plywood is okay), for example, so “stopping deforestation” is a red herring.

Also some of them are transporting the paper all across the ocean; it’s not a grievous negative, but it’s not a positive.

[1]https://static1.squarespace.com/static/5788e6f23e00be7706ac5...