Earlier quoted context omitted.
Actually NOT blocking ads is at the very least morally evil and degenerate. You are a very bad person if you think adverts are morally justifiable in any form.
Flyers mailed by local grocery stores regularly let me know when stores I don't normally shop at are having a sale on something I need, which lets me save money. How is that immoral?
If you find these flyers genuinely helpful, and you explicitly gave them your consent to send you the flyers, then by definition it is no longer spam, and thus it is not immoral. But if you did not give your consent, then they are spamming you. How are they supposed to know if you want the flyers if you don't explicitly give your consent?
Maybe if I mailed you my shit, you'd find it useful, maybe not. But if I just mail it to you every week without your consent, it is the same thing as mailing flyers without your consent.