For me it’s Whatsapp. Like 99% of people i know use it so yeh… i still need it. I am considering moving the Whatsapp Gdrive backup to a local backup btw.
Google photos is also a major problem for us. We have a lot of stuff that want to migrate to different service (or store locally).
It didn’t take too long to get away from google. I had my first google mail account only for registering my first Android phone. It has never been my main email address and I was always annoyed by this “log in with google”, so I never used that. In return I had almost no services connected to my google mail.
Then I just flashed LineageOS and created a mail address at mailbox.org. After that, I quit Facebook, Instagram one after another, but I haven’t used those services in a while.
The hardest was leaving WhatsApp, but I now have my whole friend circle and my 80+ parents on signal, so that’s great!
All in all it was a process over multiple years, as I had to learn a lot of things. But I left early enough to not get involved with the modern shit. Nowadays I flash phones for friends, running some self hosted stuff such as Jellyfin as a side hobby.
I finally ditched Windows 2 years ago, I was always afraid I could play video games anymore. But oh boy I was wrong, Linux Mint is a beast.