PffftGoogle
Google
You’re examples:
Google.
Your examples are all fucking google.
Could you explain how "any email service" means Google? Is ProtonMail a Google service?
OP's question was about how power users can keep UX control while services degrade their features to cater to average users. That's what I care about, not ideological purity in my software stack.
People like you are the tech equivalents of the militant vegan.
Gmail: any email service
Android: root it, use a custom launcher and utility apps.
GMaps: Waze (lets you provide your own speech samples, even)
You don't have to secede from these whole platforms - just extend around them and reach into them.