The phrase "dubious value" means something that is considered to have little worth or reliability. It suggests that the thing in question might not be useful or trustworthy. Full definition
DIY social media or online «database» searches are often of dubious value, and even worse, may lead to serious errors in judgment. (proformascreening.com)
Learn about a type of insurance policy with dubious value - Identity theft insurance. (knowzy.com)
The problem with this measurement is that for going concerns, much of their current assets are not current assets at all, but rather fixed assets of the most dubious value. (mjwhitman.pressbooks.com)