Their founder Nick Kokonas is quite interesting and seems to have a bit of an ongoing fight with OpenTable, Tock even built a tool where restaurants can analyze if they're paying too much for OpenTable's services [2].
If it interests you, check out his interview on Tim Ferris' podcast, it's well worth the listen. [3]
[1] https://www.exploretock.com/join/ [2] https://medium.com/tock/weve-built-a-website-to-check-if-you... [3] https://tim.blog/2018/10/18/nick-kokonas/