In the last 10 years, I've noted when couples mention that they met on Tinder. It's getting to 50% ! This isn't necessarily married couples, but established relationships (1yr+), nonetheless.
I also have to assume that a factor that would need to be investigated is whether it isn’t simply that people who met on tinder like telling people that for some reason, possibly because they are the transgressive, rotating door, “hookup culture” types that would have a proclivity for using something like Tinder.
I was not specific about when I asked or if it was unprompted. I qualify that the relationship has to have begun <10 years ago.
Also, no mentions of Tinder in any of the other of this last 30 comments.