I, too, saw our friend @BAMAJOHN1* use his NSFE Handle to post a ‘heads-up’ to you, and he’s notified several 3P Sellers whose handles he recognizes, such as long-time sellers like you, of this ongoing trend (our people who keep track of such things noticed the historical Seller Feedback count begin to fluctuate between 072423 & 090823, at which date the count that had been decreased by 1 from what it had been every day in between, and I’ve been recording reports of the phenomenon from various biz-discussion venues ever since; Estabrook1 wasn’t imagining things when s/he told Bama that it’s been going on for some years now.
Bama’s been around for most of this present century, at the very least - he used to post back in the Seller Soapbox Days - and, like many (including even expatriates like yours truly) is very proud of being an Alabamian.
I used the word ‘fluctuate’ because of the data we keep; we’ve charted several instances (more for one SoA Account than the other) of the count going down, & then back up to the same level without any Seller Feedback being received in the interim (we no longer programmatically leverage the RaR [“Amazonese” for “Request a Review”] functionality, which likely goes no little way to explain the sparsity which now prevails for us, 'tho it is also worth noting that the shine’s obviously long-since worn off the apple in the Buyer Community, with regard to leaving both Seller Feedback and Product Reviews).
It’s partially because of that data that I’m not yet convinced that Amazon’s actually engaged in this onslaught with malintent for 3P sellers - I think it more likely that it’s released yet another poorly-parameterized Amabot designed to protect from 16 CFR Part 465/16 CFR §465-based Trade Regulation Rule on the Use of Consumer Reviews and Testimonials (link, Federal Register) non-compliance fines - or mayhaps tweaked the one it unleashed, w/ a some degree of precision more than now seems to be the case, that produced Amazon’s lawsuits heralded in the 022222 About Amazon Blog article "Amazon Sues ‘Fake Review Brokers’ Who Attempt to Profit From Generating Misleading and Fraudulent Reviews " @ https: //press.aboutamazon.com/2022/2/amazon-sues-fake-review-brokers-who-attempt-to-profit-from-generating-misleading-and-fraudulent-reviews.
There are of course various other explanations for what many of us are seeing, but I do think that’s the most-likely one.
*
And also a fellow member of the SAS, which is why his tag is an active link