Only way for them to "abandon" the token and not getting sued for it, would be that they would just burn rest of their tokens and slowly buy rest of them from the market and burning them. But that might make it more popular and they have been pretty much flying under a radar and they might not want attention to some of their practises.
Because if enough people end up getting screwed by this, betfury will pay a price. They can't get sued just for bad price, but they have done huge mistakes on their advertising and team members implying and directly promising price growth in the past. And since they obviously are serving citizens from restricted countries, they could get in real trouble if they exist in a country that has extradition agreement. But at the moment, there's not enough money on the line.
I guess that for the whole time of the Betfury project's existence, they have such an audience of users who prefer to get stable daily dividends for BFG staking rather than speculate on the market. In other words, most users are unlikely to have any legal complaints about Betfury as long as BFG staking on their platform works.