I doubt this particular issue has impacted the volume of LBC because it is not a new thing for them to implement. KYC was always there in LBC and they used to force KYC as soon as a particular user reaches a certain volume! And the KYC free volume is very minuscule and takes very less time to achieve! So it has not affected the volume of LBC in any way.
Just a few days ago I've posted this:
LB is dead for me
Many of the users I've dealt with during the years have gone silent, the new ones offer prices with quite a heavy % on bitstamp, less and less banks for national transfers...Really not attractive anymore.
LB is losing sellers and buyers and the ones that are left are hiking the %.
If I might add, I think most of the traders, at least in the EU and in 2 other countries I trade with, do this as a business. They're buying and selling as often as possible, just trying to make some regular profits off the difference in spreads (which gets a lot more interesting as Bitcoin price grows). Then you've got guys like me, who only sell! We earn in Bitcoin and we just make sell offers to get a better rate than at an exchange (or in my case, get instant deposits with some currencies).
I don't think there's any single reason, but I'm sure it's more to do with OgNasty's share on KYC.
And this is another problem that me both might share as we live in the EU.
Authorities have started to look into it and have already taxed or are planning to tax profits made from trading.
For some that have made a lot of trades during the years and now they are faced with thousand in tax payments it's better to close their accounts and hope that if they stay quiet this year maybe the IRS (or what is called in other countries) won't notice them.
I have the phone number of two of my favorite traders, both haven't been active for at least 4 months on LB, one has told me he isn't dealing anymore, the other number is closed! (not out of reach, is closed down, terminated)