I'm in Norway. There are plenty of different ones depending on where you live.
You pay a membership fee, and for the use of the car (based on hours used and kilometers travelled). You get a card which opens any car you've booked, and you are free to use it as you wish until your booked time is up. Then you return it to where you found it.
I've used it for moving (borrowing large vans), intercity travel during covid (to avoid the bus), and longer summer trips in the mountains. My go to car is a Skoda citigo. A small electrical vehicle. Just large enough for two people and their bags.
I've swapped planes for trains, omnivore diet for vegan, I travel by bus in my everyday life, and am a member of a car collective for those few times a year I actually need a car myself.
I don't preach any of these things, but I talk about it / mention it when it's brought up. Everyone somewhat close to me knows about my lifestyle. My philosophy is to show it's not only possible to live like I am, but that I can still enjoy my life to the fullest in doing so.
I also support local organisations and political movements financially, and vote for the parties I believe have the best plans for the future.
I don't expect any celebrities to be active voices for causes I believe in or hold dear for me to enjoy / consume their work. I never paid attention to anything she did apart from her music. If I hadn't been on Reddit I probably wouldn't even have learned about the whole ordeal which lead me to stop listening to her.
She's a billionaire American. She and I have nothing in common. She wrote lyrics I connected with, with beats I could enjoy.
I was a huge Taylor Swift fan until she knowingly started dating a racist, sexist dirtbag. Dating someone with such views means you excuse those views. I was and am not willing to financially support someone with those views.
I also used to fly a whole lot. Probably once or twice a month on average. I developed a bad conscious about it and just stopped. I allow myself to fly if I absolutely have to (has happened twice so far), but otherwise I only travel by train or bus. My vacation destinations have changed quite a bit, to say the least.