My accounts generally only give one review. Then there is the greatest effectiveness.
If I add another opinion, it is always in a place a maximum of 15 km from the previous review.
The problem occurs with real people and accounts created for reviews only. It looks like account activity doesn't...
I have about 60% sticky reviews on fresh accounts.
Older accounts (max. 2 reviews) around 10-15% sticky reviews.
I use special software and I give over 200 reviews a day. The effectiveness was always 97-98%.
Do you have any news?