Please take a look at these decks: https://ankiweb.net/shared/byauthor/2092396805
They have negative reviews from genuine users but suddenly all of them got lots of positive reviews in the last few days. It seems like a scam to get people to buy something.
Yes, for instance this one is kind of suspicious, most positive reviews are from the same day (11/8/2020) and include the keyword “bought”. He or she is not the only one making a paywall with demo decks in Ankiweb. This has been done for ages.
Thanks for the heads up, I’ve dealt with it.
Evita: I do not monitor this category, so if you want to get my attention here, please @ me as Guillem has done.