It's less that and more of their underlying business model. Their model is to be lowest price. To get that you have to be lowest cost. To achieve that they hire a couple of smart people and have them build a software package that automates most of what humans do in other brokers. Then they hire a bunch of customer service staff at well below market rates, knowing that they'll get flunkies but not caring because they really don't have any responsibilities except to cut and paste stock answers. This works fine for 95% of situations, so if you're doing straight stock trades with them or anything that doesn't involve margin, and nothing ever goes wrong, then you're fine. So 95% of their customers are fine. The edge cases they just program to ensure that IB never incurs any risk, and as long as they don't incur risk they don't care if they're treated properly or not. I'm guessing they have a couple highly paid attorneys to deal with the fallout from that.Got that. SPX options are fairly liquid (Not across all strikes), but they should be fine for the case you mentioned.
I will do the search and see what cases exactly are traders complaining from.
I guess IB grew too large that they became arrogant (Typical of any company which climbs the rank of market share). They don't want to listen to their customers. I think it's the beginning of the end.
It's not a moral judgement on them, their business model is simply set up the way it is. It enables them to offer low/no commission and low margin interest rates, and makes Peterffy a ton of money, so it's doing what it was intended to do I guess. It's just a singularly bad place to be if you're trading vertical spread, selling put options, or a half dozen other edge case situations where they're really bad and their model calls for them to not give a shit. If you're not in one of those cases, they're probably fine. If you are, it's a horrible place to be and almost any other broker is much better.