What matters to me about that list is not so much the question of discontinuation (and yes, the error I hinted at before is still there and no I'm not going to specify it), but the question of its practical relevance. You brought it up as an argument (my interpretation) against the viability or usefulness of cloud storage. I think that's fair in cases where such services end in an unanticipated way, resulting in data loss, but the list contains several entries where this was likely or demonstrably not the case and fair and timely warning was given to users. From my end that's also the reason why I hesitate to further work on that list as it's in my view misleading in the way it's being used.
My bringing up the topic of discontinuance of cloud storage services is NOT so much an 'argument' against its usage (I *still use* cloud storage myself for several different purposes!. as much as an EYES OPEN cautionary to those considering its usage. I am not a Luddite, nor am I being an advocate to NOT use cloud for storage...use it WISELY and with open eyes.
I posted links for a number of aspects of 'lost data' in another thread, to illustrate that all of the same issues that we have in photography are replicated also in the music world, and the video arts. Another EYES OPEN...that the solution to 'lost data' does not yet exist, neither in photography NOR in those other areas....using multiple cloud services is a costly solution to individuals living on limited income. And there have been other posts, in the context of music data, about folks not having access to digital files stored decades ago because of format changes, hardware evolution (and later nonsupport), when one cannot find the time (or motivation) to perpetuate the migration as time passes.
But this is all well off topic of OP!