and each time not a single explanation on even feedback email from the employer
Welcome to the world of interviews, it's normal not to get specific feedback these days.
I would say you need help with interviews, and forget about "blacklists".
It is unlikely you are being blacklisted (I would suggest you would know the reason why if you were). If that was the case, two scenarios would happen:
- you wouldn't get interviews at all
- you would fail at the background check/references part.
The first would imply employers were colluding on hire info, unless your industry is particularly close knit this doesn't happen.
Second is a more likely possibility, the employer is badmouthing you, but it's not what you describe, you only get an interview so I don't think this is happening.
You need to sell yourself at interviews, my guess on your comment on wasting your time suggests you are coming across as nervous or disinterested. Work at things like that. You obviously have the skills as you get the interviews.
And get over the paranoia, there is no conspiracy against you.