Is it normal to unmatch with someone after you move the conversation to a different app?

I’ve only just started using online dating the last month or so. I’m still kind of confused on the basic dating app etiquette.

To start with, someone I matched with and went on a date with and have been speaking to frequently unmatched me after we moved the convo to a different app. I found this a bit bizarre? As they would have literally had to go onto my profile and unmatch. What would the purpose be of this?And this happened before we even met.

I’m just confused as to what that might mean. So far, I think they’re absolutely such a sweetheart, but this has just baffled me. Is this standard for online dating?what would the purpose be?

Additionally, is it quite common for men to swipe yes on pretty much every woman?I enjoyed meeting up with them, but something about the idea of men just mindlessly swiping on women makes me cringe.