I've been a BE member for 12 years and have not gotten the audit email. Someone upthread mentioned they were told this is happening to "all" accounts, though not sure how accurate that is. I have just over $5000 spend over the past 12 months, and have another $3000-$4000 in the next 2 months. I also have 3 unique travelers, so I'm good to go into 2023 for redemptions. But since I only had around 700 points left, I redeemed a BXP1 to hopefully use in the coming year. I've also already redeemed 2 BXP3's for travel in a few months to Europe and those seats are confirmed (2 of us traveling).
In the event they do audit me, and are not satisfied that I meet the requirements, I'm going to assume they could just as easily take back those 2 upgrades (6200 points total) that are already confirmed but the flight hasn't happened yet. Fingers crossed....
I'm thinking it's time to cash out for BXP1s (unless we think that certificates also get frozen)...
I very much could see them doing audits on everyone, especially with the recent rules changes.