The alternative is a discord server, which in privacy terms is questionable choice too.

I use a Discord-Matrix bridge to communicate with some groups that are only on Discord. Of course it still all goes over Discord's servers so the messaging itself isn't private, but you at least don't have to use Discord's proprietary client, and the only data Discord will have is the data you send it from the Matrix bridge (plus identifying data on the Matrix server you're using).

What do you usually use and offer when people ask you for contact?

Signal as a preference—not because I think it's the best chat app (I dislike its centralised nature; not being able to self-host is a near-on dealbreaker if not for the fact that everyone I know is on Signal; and it requiring a phone number to sign up is also bad for privacy)—but because it's the one the most people have. All my friends are on it luckily, by nature of my friends largely being communists or young queer people (or both). I also offer SMS and email. If someone asks a pretty open-ended "how can I contact you", I might also mention Matrix and Simplex as options in case they have those.

Do you use ba[n]king apps?

No, and I really don't understand why people do unless your bank requires it and there isn't another appropriate bank that doesn't require it. I've tried my bank's app (which works fine on GOS luckily) and found it didn't offer anything the web UI didn't offer, other than the option to use the app as 2FA for banking stuff, but I just get SMS 2FA from my bank.

What’s your way of transport after having few beers in pub? Do you use taxi via calling it directly or use that weird Telegram taxi addon?

I don't use taxis; I use public transport. But if I had to get a taxi, I would probably either use my GPlay profile on my GOS phone to install Uber, or I would probably just ring a taxi company over the phone.

Is there a way to convert google map pins to open source solutions and vice versa?

I'm not aware of a way. I've just told people to either give me an address or coordinates, because I don't have google maps.

What’s your recommended software for directions? What do you use for driving?

Organic Maps has been my go-to for a while. It's wonderful. Works well for driving too. I use RHVoice for text-to-speech, which iirc was recommended to me by a fellow lemming.

I don't track fitness activities, and I use GOS+Pixel.