I've been approached a number of times by clients who've trawled through such lists for their initial ideas, and although it can cause some interesting frustrations in expectations and communication if not properly managed, I've evolved my view on these in that it no longer bothers me, and in fact I now welcome it.
I encourage them to show me what they like, and to explain the feelings that these prototypes evoke, and then spend time with my client determining what they need and want to communicate with their corporate ID. I do the whole process (questionnaires, brand discovery, mission & vision statements, moodboards etc) for folks who are first-time-out-of-the-gate, an abbreviated version for folks who've done corp ID development before and indicate that preference, and in some cases go straight to brass tacks for the chronically fast-paced.
For designers themselves? I agree with Scott - click-bait and aggregated content.
That said... after years working in the architectural field, I do seek my own precedent images for complex projects, and aggregate them for myself - but they typically have a set of project-specific parameters and are not based on "currency", "trend", or "zeitgeist" at all; some of these may (or may not) make it into a moodboard that's client-facing.