I am fully interested in this thread because I will start working (remotely) with them soon.
In my opinion (or maybe what I want to think

) most of them are "just in case clauses", I mean, they will not apply them but in really uncommon cases such a trader that left the company and now is making millions out there and they want "their piece of the cake". I don't think that they will sue you if you are making $30k a year? I don't know...
Be careful, though. I recently read a comment on glassdor about this company saying that once he left the company they didn't give him back the unvested money.
Regards