Why text response times is slow with online friends?

Guys, I am just wondering about something. Recently I downloaded an app where u pay a person for their time to chat with u. It is also a streamer service for streamers to earn money. But the thing is whenever I talk to them, I get slow replies, some hours if not even days. And the only single reason I have heard and nothing else, is that they are busy. Fair enough, everyone have commitments, be it school, work or social life. However there seems to be a pattern where the people I have talk in school, some not even met before, reply at a much faster rate than those pen pals. I even see people texting their friends on their train, in class or at the office. But it just seems to be impossible for those pen pals to reply me at those similar times, which is the weird part. I have been wondering for a very long time but still get no answers. I believe if a person I wants to talk to u, they will make time for u. So why is that people I have not even met in school replies me faster than those pen pals, and it is not even school related. I think first of all those so called pen pals don’t even see me as a friend in the first place, and is just there to earn streamer money. Can’t be that they are busy 24/7/365. Even after helping one streamer to go past her target by donating her monetary gifts, she still came back asking for more saying she needs to meet targets. And still she still has no time for me even though I helped her. She was friendly at first but stopped replying me once I ran out of money, and reason given was busy. Can’t be that coincident right? I think she is making a weak ass excuse. Also the attitudes of those streamer girls are worse than my real life friends and classmates and I wonder why. Probably they have less education and resort to streaming. What do you guys think is the reason behind this?
Why text response times is slow with online friends?
Post Opinion