From internal leaks within the company as well as external analysis, the tip of the iceberg behind Facebook's spyware empire is exposed. Take a look to better protect yourself when you're not even on the platform: https://simplifiedprivacy.com/facebooks-corrupt-off-platform-surveillance/
My mom lives in a different country, is retired and can very easily use Signal to msg me and do video calls. She has no technical education, and is not very good with the devices. But... she could install Signal and use it every day.
Congrats, one data point doesn't define a statistic. Equally, I have family who only use Messenger and can barely work with that. So from my statement, these people exist, even if it's just my family. I know I've seen a lot of similar experiences but even just my direct family is enough to justify me stating that just not using facebook doesn't work for everyone.