I do some maintenance myself but not oil changes - mostly from a time/cost perspective, I don’t really wish to go down that road and deal with spills in my driveway, etc. However the oil collection part isn’t particularly hard around here. I don’t know if there’s something similar in the US (or wherever you are located) but in Canada we have UOMA (Used Oil Management Association), a nonprofit which partners with garages to coordinate the recycling of used oil and related byproducts. They have a handy map which shows me 5+ garages in a 10min radius from my place which participates, including the shop I already go to - and I’m in a medium sized agricultural town, surrounded by corn fields, an hour from the nearest metropolitan area.

I was curious about what they did with oil when I drove my first car, so I asked my garage. They showed me the tank behind the shop, someone came to empty it once a week or so. I always assumed that was the usual practice, but I legitimately have no idea haha.

In my town, UK, you go to the local landfill and there is a tank to pour it in.

I just leave it in the shed in the bottle until I have enough other stuff to get rid of and do it all at once.

For what it's worth, where I live in New Jersey, automotive shops have to accept used oil - precisely to avoid this sort of issue. (And I trust that someone, somewhere is making sure that all of their oil actually goes somewhere safe, instead of - as you point out - being dumped into the ocean.)

I still don't change my own oil, because I'm at the point in my life where I can afford to throw $100 at that particular problem, rather than spending a dirty and greasy hour+ under my car.