As one of the people who initiated the hidden likes test on Instagram, I can confidently and authoritatively say you're incorrect. There was no ill intent. It was solely to see if we could make people feel less self conscious by decreasing social comparison. Our hope was to decrease the pressure normal people feel about sharing their lives with their friends and family. We thought this might improve some long-term metrics, but once we discussed the rationale for the test with leadership, the well-being opportunity trumped any impact on metrics--positive or negative.
Also, we [IG] did this first, and we started it for the right reasons. Blue followed our lead. Believe it or not, there are people who give a shit about well-being at FB.
[edited because jazzy was right that I was too harsh]