A Nike shirt with a Nike logo on it isn't a problem.
I would never buy a jersey with a big digital blur logo on it unless they spent decades innovating in the fashion industry on top of their crypto junk.
In the case of sports uniforms, the visible logo grants a discount on the kit.
Our youth club got a pretty good discount from Nike to switch from Adidas, but it came with the stipulation that the socks need to have the swoosh on them too. You can buy soccer socks with the swoosh at any sporting goods shop for the same price as any other soccer socks, so it's not a big deal.
Our club is a 501c3 with open books, meetings, etc and the expectation that parents are involved, so I can confirm that absolutely no logo appears on anything unless it has some sort of benefit to the club. The sales reps that visit don't assume otherwise, so it's a pretty safe bet that this is standard practice everywhere.
Shirts - I typically don't buy any that has branding visible while wearing. If I have any, it was an oversight on my part.
It just occurred to me my jeans likely do. If I can find a clean way to remove them, I'll do it.
Car: Good point. I guess I won't as it will affect the resale value (and cost money to remove it properly). But when buying a car, if I get the option to get the same car without the name, badge, etc - I'd take that option.
Backpacks: Rarely use them, but you have a point. If I can cleanly remove them or buy quality ones in the future that don't have a logo, I'll do it. I suppose I could just put duct tape on the logo.
Note: I'm not against people intentionally keeping the logo if they want to promote the brand - this is not a moral crusade on my part. I just want the product at a cheaper price if I am going to provide them with free advertising.
I don't buy anything with a brand logo on it myself, and see it the same way; it's advertising space for something I already paid for.
I've honestly thought about the car thing too, after I saw a car without a make on it (I think it was a custom built thing for some super-rich guy). I was thinking about replacing the logo with something fun, but couldn't be bothered to figure out what it meant for the insurance (believe it or not, it can mean something).
I would never buy a jersey with a big digital blur logo on it unless they spent decades innovating in the fashion industry on top of their crypto junk.