I’m not the OP but I’ll note that google domains was the only way to use a personal domain with a consumer/free gmail account without that “sent on behalf of” thing, if I recall correctly. I moved away from Gmail a few years ago, so I’m a bit foggy on the details, but that was why I moved to google domains way back when.

This was also why I chose gDomains, and I'm very sad that they're getting rid of that product now. I guess I'll have to look at my options again soon.

Thanks for replying. So if I understand before this correctly before this event you could use a google domain with gmail without having to sign up to google workspaces?

Ah, not quite — sorry for my confusing reply! It’s just that you could “send mail as” your custom domain without “on behalf of” showing up for the recipient.