This is a good opportunity for people who are ready to face some risks, but for me it's kinda too uncertain - there's still one month before the fork and a lot can change, maybe something will force exchanges to change their stance on SegWit2x, maybe the fork itself will get canceled or it will be so disruptive that it will lead to some loss of funds for exchanges. For example, Bitfinex credited only 0.85 of BCH for each Bitcoin due to their mess up with margin positions. Since there are so many parties involved in SegWit2x, I'm sure that its price will be supported and even pumped for long so most people would be able to dump it like it happened with BCH. I don't see any need to face risks, unless you want to trade as soon as markets will open to catch some pump.
Well if you read up the policies, it's actually stated that BT1 will turn into BTC no matter the fork happened or not. Personally, I didn't do it because I do not trust exchanges, so I don't feel like putting all my Bitcoin into the platform, but I'm sure there are people who trust exchanges, for example, people who lend swap in Bitfinex, this is an opportunity for them.
I guess you probably misunderstood a little, I've friends who do the same thing during Bitcoin Cash fork, and it works fine, the one you said about them crediting 0.85 BCH per BTC is actually a different case here.
