Of course you can. It's called blockchain analysis and it can be made harder through the use of mixers and the linkage may very well be inaccurate. You do realise the cost of moving coins right? Who in the right mind, trying to scam individuals would use them?
Not sure how mixers work from a technical perspective. My take is that no matter how many different addresses you bounced it through it can still be tracked.
Lets say you have a flagged address and you unload into 47 additional ones... out of those, each gets bounced into 369 more... you can still keep track of those and link them to the initial one that was flagged.
Then, let's say they start to converge to coinbase or any other exchange that employs this scam lookup service and they either block your funds or reject your transfer...
Sure it would take a lot of work and dedication and probably become very costly.
It would have to be community based since otherwise, being run by a corp could lead to mal intent or just plain misinformation for pure corporate greed/profits and/or undermining competition.
I'm sure it could still be tricked, abused, circumvented... but at least it might catch a chunk of scams that otherwise might not be caught.
Yeah, it would probably end up being a game of cat and mouse like any other tech related service... think of OS/Network security, antivirus industry etc...
But it could have its own niche and it might just work to block/flag scams, even if it's on a modest scale.
More people contributing to it, would undeniably fine tune the service for future applications.
Of course, I'm speaking here hypothetically and the service would need to be constantly updated and most importantly become popular and adopted by big players, but I wouldn't say that it would "not be useful by ANY standards".
Okay, if I were to start scamming people, do you think I'll give them a new address or an address that is associated to my other scams?
I'm not hating, I'm just questioning the rationale.
Fair enough...
On the other hand... Let's say you start your scam website and/or craigslist ad... and start spreading your 10-20 payment addresses.
First day you get 3 people that buy in > they send you their btc > you cut any contact with them > they get antsy > start looking for ways to fight back.
They stumble upon this service and flag your 3 addresses that are also linked to your website CL ad(title) or w/e the initial source was.
Next day, someone that is more research savvy stumbles upon your ad and starts digging.
Again, going back to how popular this service would become they could spot it in an instant.
Indeed this does not mean that by flagging addresses the scam gets shut down in and of itself...
There are already multiple websites/discussion forums that question the validity of sellers or service providers that seem shady.
What I'm trying to argue here is that it could add an extra layer of help to an already challenged sector of the industry.
Bottom line... I would dedicate a small portion of my time to contributing to such a project.
Would I try to develop/run this as a business for a profit?
Probably not.
But I would be open to contributing with anything I could 5-10 min a day every other 7th week if such a project were to be started.
my 2c