Last week I saw this and decided to install Opera with VPN(link) and tried it.
Why VPN? for extra security when I surf outside my home using my laptop + wifi connection when I'm on vacation. Otherwise, I use my cell phone without using a local wifi.
The main complaint against Opera with VPN was too slow. See one example(link). I checked the speed at home on my laptop and the numbers were lower but I didn't notice it's slower. I don't care about the browser on my cell phone.
Used opera w/ VPN for a while on my Mac. It's "free" for a reason--Opera's partners are still collecting your data and it's more like a proxy than tor.
I actually wasn't too disturbed by that since it was still better than everybody tracking me--but I've since gravitated away from Opera and towards Brave. Brave has a built-in tor browser if needed and is MUCH less an energy hog than Opera. Opera would cut down my battery time by at least a third, at least on a MacBook.