It's a pretty drastic assertion (and quite HN worthy) that a whole industry is abusing their developers, based on not even one job, but your impression of a job based on an interview. And assertions like "they expected us never to see our family", because you couldn't take your laptop home? Maybe if you had taken that job, you would have left the office at 5 pm, 95% of the time. Maybe not, of course, but you don't actually know.

I've been working in HFT for nearly ten years, in multiple different roles. I've met well over a hundred developers in the business, have at least a dozen I'd call friends, who are spread over nearly as many companies at this point in time. Most folks have had overwhelmingly positive experiences in the industry. Like anything there are exceptions, but I've seen no evidence of a systemic problem in the field. I know a few people who left my firm to go to Facebook and found it more stressful there, for instance. Certainly, I've worked with very very experienced ex-gamedevs, who would say unequivocally that developer abuse is a far bigger systemic issue in game dev than in finance.

Obviously it's fine to post your take but it should be tempered by the relative amount of experience you have.