If I want to have security, I would use a different communication protocol. I find it unacceptable for an SMS app to change quietly change to a different protocol, particularly if it causes messages to fail to send.
I found Google messages to be unreliable: refusing to send a SMS if the Internet connection is bad. The signal that the message failed to send is a single hollow checkmark.
I switched to fossify messages, which just sends SMSs or MMSs and doesn’t create its own flawed messaging protocol
Linux is often used to refer to a family of operating systems including Ubuntu, Debian, fedora, red hat, ect., which all use the Linux kernel.
However, GNU/Linux may be a better name for this family of operating systems, since they all use GNU components and (to varying extents) embrace the philosophy of the free software foundation.
Android uses the Linux kernel, but not GNU components, and do not embrace the philosophy of the Free software foundation.
Stalman, the man who founded GNU and the free software foundation published his thoughts on this: