  We advocate an idea that ``non-baryonic" dark matter in form of nuggets made
of standard model quarks and gluons (similar to the old idea of the Witten's
strangelets) could play a crucial role in structure formation. The
corresponding macroscopically large objects, which are called the axion quark
nuggets (AQN) behave as {\it chameleons}: they do not interact with the
surrounding material in dilute environment, but they become strongly
interacting objects in sufficiently dense environment. The AQN model was
invented long ago with a single motivation to explain the observed similarity
$\Omega_{\rm DM}\sim \Omega_{\rm visible}$ between visible and DM components.
This relation represents a very generic feature of this framework, not
sensitive to any parameters of the construction. We argue that the strong
visible-DM interaction may dramatically modify the conventional structure
formation pattern at small scales to contribute to a resolution of a variety of
interconnected problems (such as Core-Cusp problem, etc) which have been a
matter of active research and debates in recent years. We also argue that the
same visible-DM interaction at small scales is always accompanied by a broad
band diffuse radiation. We speculate that the recently observed excesses of the
UV emission by JWST at high redshifts and by GALEX in our own galaxy might be a
direct manifestation of this AQN-induced radiation. We also speculate that the
very same source of energy injection could contribute to the resolution of
another long standing problem related to the Extragalactic Background Light
(EBL) with known discrepancies in many frequency bands (from UV to optical, IR
light and radio emissions).
