I have been thinking of getting away from the Google ecosystem (while still staying on Adroid) and microg has come onto my radar. I understand that it's a service that tricks other apps into thinking Google Play Services is installed on the phone, thus allowing the app to work on a phone that does not have Play Services.

How do I find out which apps these are, exactly?

From what I have read, not all apps from the Play Store require Play Services, and exactly none of the apps from F-Droid require Play Services... is that correct?

The goal of this question is to figure out if I need LineageOS with microG or just LineageOS. I have moved off Google services already but still use some mainstream apps like WhatsApp, Snapchat, and TikTok.

TIA