Nansen.ai Software Engineer Full Stack interview questions

I'm a senior Software Engineer with a history working in DEFI/Blockchains sector as well as Backend Engineering. The process consists of a technical task and multiple interviews after it with someone from the hiring team, someone from the technical team and the tech lead. So after I did the technical task and passed in it and after doing all the technical interviews and the discussions with all the different team members , they decided its ok to ignore any further inquiry email from me or even give a feedback about the process even after investing too much time in their very long hiring process ... TLDR; Bad company with zero experiencing in hiring technical teams, a very long hiring process and a very unprofessional hiring team.