Performance Matters. Even Google fonts should be self-hosted
Self-hosting fonts really have a huge impact on performance. We also added fine-tuning per font-weight to choose FONT DISPLAY options such as swap, block, fallback … Besides font display, you can also fine-tune which font family and font weight you want to preload. Font preload will remove that nasty font swap when the page is loaded for the first time.
GDPR Friendly
Not self-hosting and using Google Fonts CDN will lead to users ID addresses are personal information leak. If you are doing that you can pay a big fine. Otherwise you need to bloat websites with GDPR complainant banners that will ruin design and users experience. Oxygen and many other builders by default use Google Fonts CDN.