I have been in bitcoin since 2012, I have gone through the first 8 years without getting scammed. Last week did my luck ran out.
bitcoinmixer.org was running a campaign last year on bitcointalk, since then have I used the service for small amounts.
I have always supported new bitcoin startups, bitcoinmixer.org seams like nice project since i believe mixers is much needed in the future due to nature of the bitcoin design.
Unfortunately is bitcoinmixer.org a long haul scam, he has used 6-7 month to build up reputation, through online articles and campaigns.
All made to catch a user that one day will send a large amount of BTC through their mixer.
They certainly build up my trust, since they have been reliable for last 7 month for me.
This is how they scam:
If you send smaller amounts through the mixer, then everything works normally, the coins are mixed without problem.
I have e.e mixed up to 0.5 BTC without any problems.
HOWEVER, if you send larger amounts, then is the money stolen from you.