Technical details I cannot think of anything off the top of my head; my issues would be with his motivations. He ascribes things to malice that could be easily attributed (and rightfully should be) to incompetence or out of touch with the customer.
So you're ascibing spying, tacking, inserting ads etc. all to "incompetence". Interesting. I'd definitely say it's malice. It's not "out of touch with the customer", it's making money at the expense of the customer.
I am on the other hand amazed at how much Slack people are willing to give multinational corporations that don't presumably even have them on payroll.
"The only thing worse than a paid shill is an unpaid shill; sellouts at least have greed as an excuse."