"Willingly" might be overstating things - Google is expert at misleading privacy notifications, and just like they wouldn't expect the local baker to keep logs of what they buy and when, and sell them to data collectors, maybe they have a naive idea that buying something on their phone is similar. They're just not aware how deeply hostile and backstabbing the entities they're dealing with are - like most humans, they're adapted to dealing with neighbors and people they know, not amoral international conglomerates.
"The cascade of reports following the June 2013 government surveillance revelations by NSA contractor Edward Snowden have brought new attention to debates about how best to preserve Americans’ privacy in the digital age."
Unfortunately time-series data on perceptions and sentiments is difficult to find. But the very fact we're discussing this on the grounds of it being or not being an Edward Snowden-related awareness speaks to Snowden's impact. As does the the fact that the matter hasn't been considered notable enough to warrant tracking over time as part of a sentiment study.
Writing as someone who has been long aware of the issue, well before Snowden. But who has also noted that the nature and tenor of discussions with others since has changed markedly.
