Has anyone used carpet as mulch?

I replaced my polyester carpet with hardwood flooring back in 2010 and put the  L/R piece under a tree that cast a deep shady area where grass was struggling and I had more dirt and mud than grass. Made a really nice patio area where I had my outdoor couch and chairs.   Worked great for a few years until a hurricane took down part of the tree and I had more sunshine in the area.  At that point the creeping bermuda grass moved in and started covering the carpet from the sides.  Crept almost all the way over the carpet, but stayed low and didn't need cutting.   Just pulled the carpet up this summer. It came up in one piece grass roots and all.   Soil is very compacted under the area.  I would still use carpet in the aisles around the beds but not under them or as mulch around plants.  And yes, I did get the idea from the forum.