On the national level, there are multiple sources of news (NYT/News Corp/Disney/Comcast/Paramount/WaPo/LATimes/etc). There are lots of sources of professionally and amateur produced entertainment. Apple/Amazon/Comcast/Disney/Sony/WarnerBrosDiscovery/Paramount/etc.
If anything, the monopoly exists on wired broadband to peoples homes, which is usually only available from one seller.