Yeah, "solving puzzles". If that's the case, surely it can wait - why does it need to be solved at 2 am? Anyway, if you're gonna be a slave for $200k please go ahead, its yo choice.
On call typically means you gotta be online and respond within 15 minutes if paged. That's abusive. If you want a person to do that, then pay them for that. As an example, on call in Amazon works the way I described, and yes it is abusive.
Your second paragraph is spot on. When ever I login I see random sheet contents and equally sheet comments. Give me a resume hosting + job post/search site any day.
Its very easy to understand. Broadly speaking, in any culture you'll find two types of people. 1. Those who question existing systems and accept the historical truths even if it doesn't paint their own identity in good light. 2. Those who will claim that their identity is awesome and will deny or shift blame for past injustices. You can see this literally everywhere.
Irrelevant where the word comes from. You're indulging in revisionism to make yourself look good. Caste system has been in existence for no less than 2000 years.