Earlier quoted context omitted.
Using a website does not imply informed consent.
No, but signing up for an account and agreeing to the Terms of Service does. The not-logged-into homepage is 1.3mb. Still not tiny, but definitely not the same as the web app.
From the Wikipedia definition[1] of informed consent (in medicine):
> An informed consent can be said to have been given based upon a clear appreciation and understanding of the facts, implications, and consequences of an action. Adequate informed consent is rooted in respecting a person's dignity. To give informed consent, the individual concerned must have adequate reasoning faculties and be in possession of all relevant facts.
What tech companies do is obtain the minimum legally required consent - and sometimes not even that. This may be legal, but it’s far from ethical.