I know it's a typical thing for me to say, but most SB brokers, in my experience and hearing the story of others, have this outlook. For some reason they don't want clients building large accounts... I think they see the $$$ in an account and think "we've only earned a small amount in spreads while this b*stard customer has made loads! Let's take some back he wont mind..." and away they then go with their tricks to claim it for themselves, bit by bit.
It's such a shame. Not ALL brokers (SB) do it... the more modern ones (whether new or revamped) seem intent on not doing this (or at least telling us they wont) by claiming they truly do hedge in the underlying and have no interest in stealing from customers. They seem to indicate they want clients for long term business so they want them to win and keep what they win.
The challenge for us retail traders is to find which ones not only say it, but mean it....
Harder than I thought
TOC