If we're expected to trust the party spying on us to reveal exactly the extent to which they spy on us via their proprietary, closed-source spying data viewer tool, then we deserve exactly whatever the fuck it is we end up getting.
If they cheated on the documentation matching the binary to try and sneak in more telemetry, the backlash would be phenomenal.
I don't know if Twitter could handle that kind of load =]
It's always good to trust but verify, although here the the safeguard is pretty strong.
It doesn't always have to be explicitly intentional as you described, but the simple fact is that they are incentivized to gather this data and they will not, in fact, suffer major repercussions commensurate with the amount of data that is collected/gathered. Look at all of the penalties that have been levied at all the other data breaches and how negatively affected those business were. [1]