I have COPD. I'm hoping I'll be included in stem cell studies at Mayo in 2020.
I've been trying to get in their groups for years. I think I can answer your question: you are talking about regenerative medicine clinics that solicit COPD patients. They often use stem cells from our body. I don't think their techniques are effective. to begin with, the use of stem cells for COPD is in its infancy. So far, the results are not impressive (under best of conditions). Secondly, hospitals at the level of Mayo have learned how to grow lung stem-cells in a lab. They can produce millions of lung stem cells and inject them into a patient. Compare that with the relatively small amount used by the clinics you referred to. There is also an issue with the quality of the cells. As I understand it, you need the specific organ stem cell e.g. lung stem cells. I don't know how many lung stem cells you could mine from fatty tissue or bone marrow.
If I get in, I don't have the optimism to believe the procedure will substantially help me. I will be satisfied if my participation was a useful link in an eventual therapy that is effective.