Samourai was a Bitcoin wallet attempting to improve the currency’s privacy. Its devs were arrested this year.

Localmonero was a platform where people could post listings for buying or selling Monero without KYC. There was also an identical sister site Agoradesk for Bitcoin. They abruptly shut down this year, probably afraid of similar prosecution (it happened pretty soon after the Samourai case).

Chainalysis is a company that US government works with, attempting to track and deanonymize crypto transactions. Recently a presentation of theirs leaked, disclosing some of their methods (which were very interesting for the Monero community in particular).