@mikeyb2001 , I brought some additional information:
Yandex Search: Planform for yandex ads - 60% of website space is advertising. SERP are being goverment-censored
fun fact: now they does't own even your own domain yandex.ru (redirect to some Gazprom media site)
Yandex Maps: Yet another ads platform, extorting money from business owners for colored pins
Yandex.Mail: A email service and ads platform (lol they use inline base64 images for banners), you must pay subscription for a more acceptable user experience
Yandex.Music: A music streaming service with illegal/pirated music
Yandex Browser: Yet another Google Chrome skin + Yandex Sovetnik acting more aggressively than the Honey extension (all small online store owners hate this) + russian Root CA SSL certificate (in simple terms is MITM-ready) + persistent Yandex telemetry
Alice: A virtual assistant similar to Siri or Alexa. Also this is smartsmart speakers, and dumb yandex develpers doesn't test firmware and make large DDOS and put down almost all russan NTP servers for three weeks
Yandex.Taxi: displaced Uber in a non-competitive way. And also ads platform, ofc