Disposable email is the only reason you can sign up to a lot of things online, the amount of spam that comes from these hundreds of mildly interesting sites is abysmal. And as a result your mail could end up in multiple datadumps yearly. No thanks.
Also, providing a disposable e-mail address doesn't make me any less of a "real person". For example, I've been here on HN for 11 years. I originally signed up with a disposable e-mail address (one of the domains on your block list), and only gave them my real address several years later, when I started corresponding with the moderators. If HN had no problem at all with this, why should you?