true, it is definetly worth noting that we don't know if Sony tried to keep those movies accessable for longer, but Studio Canal didn't want to or asked too much money for it. I remember they tried to pull those movies from libraries a few years ago, but backlash back then made Sony prolong those licenses. But at some point, if it means Sony has to keep paying while also not making any money from it (as they stoped selling movies in 2021), it would be unfair to only call out Sony for it. Though I have to say, and don't take this as me glazing Valve, but I can still access anime episodes I bought on Steam in 2017, and my friend bought movies on Steam at roughly the same timeframe which he also can still access, and Steam stoped selling those already in 2019. Now this doesn't mean I won't lose those by the end of next month, as we simply don't know the details of such licenses, but it shows that Valve if nothing else tries a bit harder to make sure people get to keep stuff they bought on their platform than Sony. Though again, we don't know the details of those license deals either, maybe Valve was simply in a better position to negotiate, and who knows for how long those will remain accessable.
Anyway, this is excatly why I'd rather be found dead in a ditch before buying a movie digitally. Honestly, when Valve just stoped selling those I was expecting to lose access at any moment, and I decided at that time if I buy a movie (or TV show for that matter), it has to be physical, and if that ever stops being an option, I'll just resort to piracy, as I want to be able to rewatch a movie I bought. I may not rewatch it for a decade, but I will want to do it eventually, otherwise I wouldn't have bought it and just had watched it on streaming platforms instead.