thats BS, they spinoff something to make you think that the only way to go from now on is win10, but if you spend 5 minutes thinking about it you will find that it's BS, lets see their options.
only windows 10, is it going to be a life long OS ? ofc not, so at some point they will introduce something new to charge you for it, what's the difference if it's called win11 or win10.7 ? the fundamentals will remain, a new version holding gaming hostage with DX12.5/13/15, forcing you to move to it whil denying for the soon to be replaced win10, so in reality NOTHING changed from the last decade, but the wording they present it to you with.
whatelse can they do ? DLC kinda thing? maybe, then ppl will have to buy original OS + the DLC, thing that wouldnt work for more than 1 DLC, because accumulating DLCs+OS will not sit right with ppl who need to get 2-3dlc, so the most likely outcome, win10 will be free, and only charged dlc, and even then, they cannot accumualte much and will only pay for the last DLC, and early adopters will feel screwed.
feel free to correct me if im wrong.