There are online poker players who have used 2nd screenames for the purpose of deceiving others into giving them action, evading taxes, collusion, entering multiple times into the same tournament, ghosting, to obscure previous results and stats, to clear extra bonuses, to circumvent affiliate CPA or rakeback rules, to bypass the pokersites shortstack buy-in time limitation, to teamplay, to share action with others at the same table, to chip dump or otherwise engage in underhanded actions I do not know about. I have never done any of these things. Beyond that I cannot and will not comment on the screename issue, nor can I say why I cannot elaborate further other than to say that my reasons for that are serious and personal.
I have played a shortstack some of the time, I will do this when games are tough and I don't want to just not play, when there is a good game at a "shallow" table, in CAP NL games, or I think it's the most profitable strategy for that particular table. My poker results are shown over my last 650k hands or so in the HEM screenshot below, and they are sorted by stack size. A good percentage of the "under 50bbs" stack size games are from cap tables, where the buy-in is 30bbs. The rest are from 20-40 BB buy-in at "shallow" tables and a 20-50BB buyin at normal tables. The collusion allegation is laughable and completely false.