I don't know how big a factor this is, but note that some of those have bundling deals with other services. For people that happen to use those other services this can as a side effect greatly reduce the annoyance of the things one wants to watch being spread over different non-free services.

I have Hulu as part of my Spotify subscription.

I have Peacock Premium as part of Xfinity internet.

I have Paramount+ as part of Walmart+.

I have Amazon Prime Video as part of Amazon Prime.

Some T-Mobile plans include Netflix and Apple TV+.