I am getting the same on my Huawei mate 20x using the chrome browser, constant browser hijacks only occurring on pprune taking me to a scam site where it claims I have won an Iphone.
To me it appears to be a malicious ad with a browser hijack script running, as if I browse using brave browser with adblock on it never occurs, but I prefer not to adblock as I like pprune and so I want the owners to earn a little bit advertising to me so the site can keep going, unfortunately until they root out the rouge actor it isnt possible, I cant go 2 minutes without a browser hijack with ads unblocked on here at the moment.