Their claims sound too good to be true, if you ask me. I am especially skeptical since they advertise that they will export your data to GitHub [0] and give their own website's repo as example [1].

[0] It's on the bottom of their homepage somewhere.

[1] https://github.com/the-domains/the-grid

Previous discussion: https://news.ycombinator.com/item?id=8428418