<...> I didn't understand this point. What is mixing service platforms? <...>
Take a look at these threads:
What is Bitcoin Mixer? List Bitcoin Mixers Bitcoin Tumblers Websites A Mixer basically has the goal of disassociating even further your crypto assets from you (primarily BTC, but there are others available such for ETH for example). They use various techniques, but the at the core they attempt to break any connection between your addresses that send coins over to the service, and the addresses you receive the coins back on. A couple have been seized over the past year or so, and theres a well known one that has been offline or non-accesible for some hours now (502 - bad gateway) ...