Re: Suddenly, Advertising!
Unless all your "personal browsing" is routed to your own home network (using mobile openvpn to pivpn in your house), and then goes out via pihole set up to cut out mobile advertisers and using DoH.
I realise that using this methodology conveniently routes ALL of my home and roaming internet activity through a single path which is a downside if anyone was genuinely interested in me. But I'm in the UK and mildly inconveniencing mobile provider/ISP/UK government information gathering (as a boring law abiding individual) brings me some satisfaction.
If I was really paranoid I could set up a second pivpn for mobile use which would routes out of my home network using openvpn as well, but like I say I'm not /that/ interesting.