If "usage imply consent" then couldn't you just write unpleasant TOS updates so that they end up in the spam filter and then argue the user complied.

sending email + user using does not in any sane way guarantee that the user did even know about it

and if usage implies consent how do you even delete you account if you disagree with contract changes, as that requires logging in which can easily be maliciously seen as using the application as any landing page contains app functionality