https://support.apple.com/en-gb/108756
RCS has never offered that security guarantee at the protocol level. Google has deployed a proprietary encryption layer on top but refuses to allow other clients access. This was rather famously part of the blue/green message divide which was in the news for years.
Similarly push notifications have had privacy recommendations for ages - that’s why apps like Signal give users the option to choose their level of risk exposure.
Each one allows for access, at times warrant less, at any moment.
It’s bizarre that you think this is “Ok”. Insane you are defending it. Combined it makes a hard hard take that they are security oriented.
Beyond that Apple has cooperated with data turnover at the personal request of President Trump multiple times. So pull your head out of the sand.