I interpret it as "we won't kill our stuff if people are using it" which is a common enough practice we have webpages dedicated to the Google Graveyard and whatnot.

I don't think anyone has or is going to build a product and advertise "We plan to stop letting you use it (even if you want to pay for it!) whenever we feel like it." This pledge existing (which, I agree, is a 'trust me bro') tells me that there is a thought-out effort for the support window.