I have bought my personal domain and started using my email address 8 years ago and I still haven't managed to move everything away from my old gmail because sometimes it's impossible without recreating some accounts from scratch.
Saturday marked the second or third year I had to pay for Google workspace because they did an about face and got rid of there for personal use program.
Do I feel duped and resentful? 100% Could I move elsewhere since it’s my own domain? 100% But am I hooked since I like Google’s tools better then anything else out there? 100%
But honestly, I could see the day someone comes out with competition to Google mail, sheets, docs, and calendar that is good enough to convince me to switch. Wouldn’t be that hard and since I own my domain I can do it.
In summation, even if Google totally pulled the rug out from under me, guess it could be worse
I have done the exact same process over the last few years --- moving from Gmail to a my own domain --- and I have found only around 10 services that did not let me change my email address. I view that as a success personally.