Google doesn't need to block them on a technical level, they just need to send a simple C&D. If Brisk keeps scraping without permission after that, they can look forward to financially a ruinous legal battle [1]. Or they could just not blog about what they're doing and fly under the radar for years and years without any concern.

[1] https://www.eff.org/deeplinks/2019/09/victory-ruling-hiq-v-l...