On April 15, 400 Amazon sellers who net $2 Billion in sales per year boycotted the site. Amazon is having troubles.

I haven't seen this covered. The video is aimed at ecommerce sellers, but it explains it pretty well.
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Summary:
In 2022, 61% of shoppers started searching on Amazon. Sellers had to go there if they wanted to be found.
In 2025 it dropped to 51%, and is plummeting in 2026.
Amazon has had 44% fewer newer seller registrations in 2025 than 2024. American sellers dropped from 26% of new sellers to 16%, and Chinese sellers are now almost 60% of new signups

NOW
68% of Gen Z starts their search on Google, Youtube, AI or TikTok
Sellers are questioning whether Amazon should be their primary outlet
Product research by customers is moving away from Amazon too

Asinine steps Amazon has taken to counteract this:
Charging the sellers for the shortfall for the customers who aren't coming to the site
Promoting Amazon basics that compete with their sellers over the sellers' merchandise no matter whether it is a more relevant product
Having AI scrape the data of their merchants without permission
Adding 3.5% fuel surcharge
Adding 7 day payout delay after delivery

Could Amazon's stranglehold be loosening?