If email providers wanted to "declutter" your inbox, they could offer you a dashboard of senders whose messsages you delete unread most of the time and offer to send those messages straight to spam in future. Instead they nonconsensually intervene to block messages and offer no way to override those blocks.
21/
When it comes to recommendations, companies have an unresolvable conflict of interest: *maybe* they're interfering with your communications to make your life better, or *maybe* they're doing it to make money for their shareholders. Sorting one from the other is nigh impossible, because it turns on the company's intent, and it's impossible to read product managers' minds.
22/