Unfortunately I don't think it's possible for companies not to abuse your information, unless it's like 1-2 people and they're independently wealthy and the business is really more like a personal hobby.

I don't know how many times I've been to something like a niche clothing retailer and they ask me to join their mailing list for a discount and I think hey why not, I should come back in 6 months or a year and see what's new, maybe they'll let me know about their Labor Day sale. And of course they immediately proceed to email me 5 times a DAY because maybe I'm ready to shop now, when I wasn't at 2:00 pm. Unsubscribing only solves 20% of the problem because of course they subscribed me to 5 different daily lists and you need to unsubscribe separately. And, of course, if you don't do it quickly enough it will be 6, 7, 8, 10, 20 lists.

They're not human. They really can't help it.