One of our accounts suddenly closed - total BS reply when inquired. Luckily total loss is just 500 Avios worth, but annoying.

Following two independent reviews of your account we have had to maintain your account suspension. Your account was suspended after issues related to your account activity were identified.
As a renowned market research provider, known for the quality of data we provide our clients, we take the validity of our research data very seriously. When we have concerns regarding the accuracy and/or thoughtfulness of our members' responses, we are obligated to take steps to investigate and address the matter.
We appreciate your participation on our panel, however, after two reviews of your account we are unfortunately unable to reinstate your account.

I've been emptying and now closing all other accounts - this has become a scam operation. Redemptions not posting, clicking survey links takes through many redirects and ending up with a no survey page, etc, etc. E-rewards used to be rather bad until about a year ago, it became totally useless last autumn.