Good to know, but to this specific case, if someone (basically) says "This is not a spinoff to let it die, but to flourish on it's own", it's nice to have them explain why they are credible when they (or previous company rep) previously said "This is not a purchase to let it die, to but to flourish as part of the collective". Just give an actual reason why this time will be different. I already know not to trust M&A statements unless they give specific plans.
I'm guessing something changing between 2016 and now. Maybe it was rate of growth, or how well Instapaper fits into Pinterest's product strategy going forward. There's all sorts of reasons it might've made sense at the time to acquire them, and for it to make sense now to let them go. You tend to not get real answers to these kinds of questions from companies, though.