If they were publicising those videos that sounds illegal to me. If I printed off a copyrighted book for my own personal use, that would be legal. If I started distributing my own reprints of a copyrighted book without permission, the copyright holder could go after me. The businesses can hold copyrighted material without distributing them and not be in breach of the law.
idk about “favourite”, but the ones I use, which are all perfectly adequate for my needs: LibreWolf on desktop, Mull and/or Vanadium on mobile, DDG