The reason people do it is because they got burned in the past with websites that started spamming them/were not as advertised.
Rate-Limit accounts from disposable emails if you must, but if you see activity past the duration of the disposable email, offer these accounts a way to transfer over to a permanent email.
Preventing disposable email registration pushes the bar just that little bit higher that it really helps with these kinds of users.
In fact, this is the reason we even had email verification at all (it used to be effective against spammers, but those days seem to have gone)
P.S. And yeah, I do recommend you to check the website for trustfulness. This list is intended for good guys who respect people rights of privacy.
This is The same argument against DRM. It hurts the legit folks and didn’t impact the pirates.
Don’t build barriers for the people you want.
I'm familiar with at least two of the services on your block-list - because I actively use them. Neither of them is limited to "one time emails". One provides addresses that forward until you disable them, and the other allows a specified number of e-mails, with the option to either renew a sender's e-mail quota or set them as "trusted" (allowing unlimited e-mails). I only disable these disposable addresses as a last resort - if I start receiving a high volume of e-mails that I did not agree to receive and can't unsubscribe, or if I see that the address has been shared with a third party without my permission. If you treat me with respect, you'll be able to contact me for as long as I use your site. If you violate my trust, you'll be treated as a spammer.
If a user doesn't want you to be able to reach him out, he absolutely should have a right to be able to do that.