When I first started hearing about it maybe 5-6 years ago, I just figured, I already have PayPal and Square Cash, I'm too old, nobody I know uses Venmo, why bother.
I've mostly ignored that it existed except occasionally hearing (usually younger) folks talking about it.
A couple of months ago I was telling some people at work that I'm too old for it, and Square Cash works well enough for me, and commented that I can't see how a newcomer could be any easier than just having the money go directly into my bank account.
When a coworker informed me that Venmo payments stay in your account, my exasperated reply was "wait, it's WORSE than Square Cash? It's like going back to PayPal?" Well, you can imagine how incredulous I was when I found out that Venmo IS PayPal, just with different branding.
For the past 5 years I've been assuming Venmo is something new and cool that "the kids" are using, but I'm too out of touch to bother, and suddenly I find out it's a rebranding of PayPal with all of the drawbacks of it. It blows my mind that something caught traction that is functionally worse than the competitor of the product it's a rebranding of!