- First and foremost, the business feels ethically shady. A lot of their "customers", especially those who call in for support, are folks getting sucked into multi-level-marketing schemes through their referrer program.
- They have so much technical debt they're basically bankrupt. Their stack is mostly PHP and some cryptic Perl. After a failed full-stack rewrite a few years ago (after which all the devs responsible were fired) it has left them a few steps behind their competitors with crappy infrastructure.
- Bait and switch - If they tell you you're going to write greenfield code... you'll probably be hacking features in PHP to play catchup.