I've been part of a 4500+ member group of Google+ users trying to get any sort of response or assistance out of Google since the G+ shutdown was announced. That's a large set of the core G+ userbase of ~10 - 100k users, with probably 10-20k as the core cohort.[1]
https://old.reddit.com/r/plexodus/comments/9ulvr0/dear_googl...
That was submitted to multiple channels on G+, to the Google Press email address, and through numerous Googler contacts. No response (though many of the issues were, and often only in the past few weeks and days, addressed, though others never were).
It's been exceedingly difficult to get any response, and that's included what's effectively been a war against us by much of the Google+ Help community moderators. Google shut down the Communities on Google+ itself for Community owners and moderators, in one case for six weeks with no notice at all, in another, with at best a few hours' notice.
https://old.reddit.com/r/plexodus/comments/aev39g/google_shu...
The details of this sort of behaviour tend toward petty and tedious, but that's precisely what's been seen:
https://old.reddit.com/r/plexodus/comments/9wi6sg/a_curiosit...
https://old.reddit.com/r/plexodus/comments/agm2j6/banned_fro...
https://imgur.com/a/5Sq0aAf
Google didn't even bother putting shutdown notice on their G+ app and About pages (the latter still doesn't say anything):
https://old.reddit.com/r/plexodus/comments/ae5lsv/failure_of...
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Notes:
1. I've made (or inspired) several estimates of total Google+ user activity, beginning in 2015 using the services own sitemaps to show that only 9% of profiles were active at all and that a fraction of a percent could be considered regular public posters. That's not all Google+ activity, but it's a very, very large share of it.
Stone Temple Consulting's follow-up study, based on my methods, looking at 500,000 profiles, gives a pretty solid view, and showed 50-100k highly active posters. There's a fair bit of churn at the top due to spam accounts:
https://www.stonetemple.com/real-numbers-for-the-activity-on...
Further information:
A Change.org petition has 38,580 signatures presently: https://www.change.org/p/google-inc-don-t-shut-down-google-p...
The Pluspora pod of Diaspora has 12,000 members.
Other signs of activity (and expanding to include non-English native speakers) probably doubles the petition and Pluspora numbers (largely English-speaking, at least as a second language).