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Nothing Phone builds a blue bubble iMessage bridge while Google and Apple fight over RCS
(www.androidcentral.com)
This is a most excellent place for technology news and articles.
In a video from MKBHD they mentioned this problem and they said that the idea is basically that Apple will not block it because it will bring them bad PR and attention from regulators who are concerned with anti trust issues. Hard to predict what will actually happen but Apple just blocking 3rd party access and citing (legitimate) privacy and security concerns seems to be a likely outcome.
Apple should block it. It requires people to hand off their apple accounts to an organisation. Someone using an account like this should be blocked by apple's servers. As they clearly aren't the account owner.
Many online accounts will return a password incorrect message, even when the password is correct, if they believe your aren't the account holder (bots, scammers etc). To allow this puts users accounts at risks.
Some bad actors are likely to mimic this setup. Advertise access to iMessage for Android users, then use the apple account to defraud or blackmail them. It will be very attractive to previous iPhone users that will have payment details, addresses and media stored with their apple account.