This mindset is what leads to utterly incapable people being hired as seniors. If nobody is willing to hire junior or medior developers, then naturally everyone starts calling themselves senior.
This is such a critical point. So many problems that plague the industry tie back to this. Lack of company investment in juniors leads to greater job hopping, which leads to building things based on bleeding edge fads to pad resumes, which leads to ever increasing title inflation, NIH syndrome, or cargo culting, which leads to the brutal churn that most everyone hates and wastes tons of man hours instead of just maintaining and improving existing software and teams.