Mostly for boiler plate code/text. Also for initial research about a topic—-thereafter, I do my own probing elsewhere and also ask follow-up questions based on my findings. It's a also a great place to ask a dumb question about anything and get a "seemingly" sensible answer without having to feel that you were judged for it. All in all, it's a feel-good tool :D
It's quite possible that they do this for their online customers— it's a reputed bank here. I'm just using the bank's credit card and don't have a bank account with them, so I don't have access to their banking app.
Yes, I asked the caller to give me a bank number to call back, to which she replied that they don't have a dedicated line for that purpose (???) and that I had to physically go to a bank to get it done. I'll be changing banks for sure :/
Slack/Discord groups - Look for communities in healthcare technology or startup study group.
Facebook groups
Survey/Interview sites - https://www.userinterviews.com/, https://www.respondent.io/ etc.
Offer gift cards or early access as a thank-you.