Every Amazon or other e-Commence seller likes to take their business next level. Like Amazon as well as other e-Commence marketplaces like eBay, Walmart or Etsy every seller wants to promote or rank their product by using different SEO services.
Now don't be imbecile by the verbose word "Trade Secret White Hat Methods" until you become 100% sure about Methods, Working procedures and SA safety. Otherwise, It's definitely "drinking old wine with a new label".
Amazon recently changed its Search Algorithm named Amazon A10. We all know that the previous algorithm was changed based on Purchases, Reviews and giveaways.
After the A9 update, it was totally forbidden to discount reviews, fake sales for ranking products etc. Amazon became very strict about payment methods (purchases without valid payment methods like a credit card, debit card or PayPal account may not allow submitting reviews and seller rated feedback) also without valid payment options endanger the seller account. So the FBM purchase was totally banned which was the main Black Hat way to rank products or keywords on the 1st page.
Now the latest change of Amazon Algorithm ( A10 ) is about all Black Hat methods Like Wish Lists, Shopping Lists, Gift Lists, Add to Card, and Weeding Registry. Amazon Just wants to highlight the best product on 1st page for customers based on their TOS.
So you should avoid the Black Hat methods like Automated bots, click Funnel, Or an Unsafe impression-creating system. Before using any Product / Listing / Keyword ranking services be aware of White Hat & Black Hat methods. Don't be foolish to hear about "Trade Secret White Hat Methods". As a seller center holder, you have the full right to know all working systems, methods, working procedures, SA safety, etc. ins and out or taking a guarantee. There are huge guys using an old unsafe working system and Black Hat methods saying that White Hat. They may not show you the methods regarding as their trade secret definitely going to flag your seller account.
By refusing to share the working system and methods claimed as trade secrets, It's like selling old products on a new label. I'm not saying that WL, SL, A2C, and GL is effected less or more dangerous but all you need to be sure about methods and working systems. Don't be influenced by the word " White Hat" while Amazon doesn't support any SEO for ranking products and of course so-called "Trade Secret White Hat Methods" otherwise, you're going to endanger your main business.
So be 100% sure about what's are you going to do with your business. Until became fully clear about SA safety don't use any SEO services for your valuable Amazon business.