I have both wild raspberry and wild blackberry growing on my place. In the winter time the canes can look very similar, but I'm leaning toward raspberry on these.
They will come up in timber (especially a place where the canopy has been opened a little) but generally not fruit, due to lack of sunlight. After the canopy starts closing back in, they will eventually just disappear and be replaced with tree saplings. Log it again in 50 years, and they will pop right back out immediately.
I agree with others that there is no reason to worry about these. Deer will browse the tips and leaves, and they provide good cover. However, if you get them in a NWSG field, get ready to spend some big money getting rid of them. They can take over a NWSG field in just a couple of seasons.