If your IP (and possible your browser) looks “suspicious” or has been used by other users before, you need to add additional information for registration on gitlab.com, which includes your mobile phone number and possibly credit card information. Since it is not possible to contribute or even report issues on open source projects without doing so, I do not think any open source project should use this service until they change that.
Screenshot: https://i.ibb.co/XsfcfHf/gitlab.png
If you want to avoid software from Google and Meta, you’ll need to avoid pretty important parts of the Linux kernel as well as pretty much anything that does hashing or compression (given Google’s involvement with WebP and Brotli, and Meta’s involvement with btrfs, zstd, xxhash64, cgroup2, etc)
Not only kernel, but also many widely used libraries. Including compiler runtimes.