I would stick to your guns and accept payment from sources you trust. If you do your research (I understand this is part of that) and feel comfortable having several apps, then by all means use them. I’m only familiar with and trust PayPal and Venmo.
Venmo is owned by a division of PayPal. It’s basically a social version of money exchange. My wife and some of our friends use it and can see, do instance, who has paid back whom after a meal where one person pays and the rest Venmo their share. While this appeals to my Facebooking wife, it holds zero appeal for me.
I use PayPal maybe once per year for forum or local purchases and maybe 20+ times per year online, where it’s accepted. All I can say is what’s already been said: don’t send money for free (ie, friends and family) unless you 100% trust the person you’re buying from. As a seller; however, there is no risk.
Ive only had a few disputes with seller over the years and had my money restored by PayPal or my CC company each time, so to say your money is GONE is wrong. In one instance, a Chinese exchange student sold me a book I needed. What showed up was a spiral-bound copy. He then went back to China. I got my money back after he refused to respond.
I have heard of people losing money using PayPal but haven’t heard of a single friend or family having this issue, so it doesn’t concern me.