If this crap actually goes through (which it looks like it will, the maintainer seems hellbent on pushing it and completely unwilling to listen to criticism) I absolutely expect one or more forks to appear with all the google surveillance completely stripped out.
I'm not a Go developer myself, but I get the impression that trust in the project was already wearing thin after the whole GOPROXY debacle; this just might push enough people over the edge to get the needed momentum behind a new fork.
Also, I really hope package maintainers with the larger distributions start shipping with all this nonsense disabled by default. Apparently Fedora already ships Go with goproxy disabled.
That's how they get you ;) There is a trade-off between privacy and security on one end, and convenience and ease of use on the other. Microsoft, Google and all the others profiting off of your data know this and offer you convenience and ease of use in exchange for you giving them all your data. So be prepared to give up a little of that convenience and getting a little more tech savvy.
I recommend you take a look at https://nextcloud.com/ - it's a self-hosted cloud service solution that offers file storage, calendar, notes, and a lot more. If you don't feel comfortable hosting your own just yet, there are providers out there that will host one for you for a few $ a month.