This has been done in Poland by Marek Falenta - private businessman. He did bribed waiters and wired popular restaurants in Warsaw to get material on businessman and politicians. It made a lot of noise - nothing top secret but enough of what politicians really say in private stuff to impact elections.

[1] https://kafkadesk.org/2019/06/13/polands-most-wanted-man-thr...

[2] https://www.bloomberg.com/news/articles/2019-06-10/polish-bu...