My peak was one. For like 5-6 years Netflix had enough content to keep me entertained by itself. When the other media companies started pulling their stuff off Netflix to make their own services I started pirating again. Why would I bother keeping track of multiple services when I can get one VPN subscription and have it all plus stuff that isn’t on any of them?
No. There’s no reason the content has to be on only one platform other than anti-competitive bullshit. They could all have all the content and differentiate themselves in other ways with quality of life features. Then people would have options without missing out on content.