• Youtube
Too much content there to stop using. I almost never use it while logged in. I never subscribe: I bookmark the channel.
• Maps
Too useful to stop using. Haven't tried alternatives, but open to recommendations. Business locations and open/close times are must haves for me.
• Duo
It's a videophone that mostly works.
• Chrome
I never stopped using Firefox as my main browser since ~2005, but I'll use Chrome from time to time, mostly for website development and watching Youtube.
• GMail
I've almost completely moved off it about a year ago for Fastmail, but I keep checking my existing GMail. Probably should get around to moving over completely.
• Android
I'm a recent LineageOS convert, but still use it with the Play Store.