Explanations for each of them in comments

Earth is a bit more caring than most other characters in this stream, so she'd gladly help

Collector doesn't care about such pointless tasks, and usually doesn't help with such simple things unless he's really close with whoever needs help

Data just gets caught up in other things

For me:

Natalie is goodhearted but cares about education and mental development so she will help, but not let them copy.

Johnathan doesn’t really help people that much outside of his friend group.

Gunslinger only checks his phone at midnight or if a notification pops up.