Until the OP mentioned it, I had no idea that Bumble had a friend finding feature. It's a dating app, its advertising shows dating as its function. So I can't say I'd blame anyone that did judge me unreasonably, to be honest. It's not necessarily that fair, but we don't get to make our own rules of social interaction.

Affairs do happen. There's love in not giving your spouse unnecessary reason for worry.

And there's wisdom in not tooling up your phone in a way that makes moments of weakness more likely to result in an affair.

My wife would have no problem with it. But what if one of her friends saw me on the bus with Bumble open on my phone? If she spoke to my wife she'd be able to clear up the confusion. But what if she didn't? What if there ended up being a persistent rumour that neither myself nor my wife could clear up because no-one told us about it?

I'm not saying it's not sad, but it's the actual reality we live in. Social lives are complex in ways we can't really control.

That said, I think for most of us the potential deterrent is much greater than that. My partner would absolutely mock me a little bit (because mocking each other is how we show love), and then probably sign up as well. My co-workers, on the other hand, would start gossiping. Having that icon seen on my home screen could be a career-limiting move.

Not saying that a dating app shouldn't include such a feature, but the association is going to be a huge headwind toward it becoming a pervasive platform for finding non-romantic friendships.