the reality is, if anyone is seriously determined to commit what they know are crimes then there are many solutions, of admittedly varying quality, for having private communications outside of the mainstream apps available on the app store. even signal itself has an apk you can install on android from their website.
so, it's unlikely this will indeed help in the fight against CSAM or whatever else is purportedly motivating this legislation. the end result will be mass surveillance 24/7 on the vast majority of the population who aren't commiting any crimes at all. it seems to me like big brother's wet dream. ironic that this is exactly the thing the US/EU political leadership have been bashing the chinese for since forever.