TBH 'protocols not platforms' has become kind of a slogan lately, but history doesn't make it look too promising. Email is a protocol, but it has largely been dominated by Google.
A really compelling product can capture a protocol.
For me personally, even if we end up with large players offering the largest (presumably most product-focused) instances of various protocols (Gmail with email, imagine Tiwtter hosting the largest Mastodon instance, Discord providing Matrix hosting), the fact I have the freedom to federate and set up my own instance or pay a smaller provider that will respect my privacy, is still a much better situation than the current "platforms, no protocols".
Maybe anecdotal every company in my experience is on Office 365. Most private people here have hotmail/outlook as they where first before gmail.
In future use a domain you own as the email address and redirect to your email provider.