It's not that they had difficulties securing a sponsor, it's that they had trouble securing enough money to continue to run at the level they are at and paying all the legal fees to get away with poaching riders from other teams.
In my opinion they actually were struggling, to secure a sponsors. If their existing partners wouldn't bail them out, they would likely fell down to somewhere in the middle if not worse. One could argue it's life, one could argue, look in football, Barcelona and Real got plenty of money, from the rewards system, and they still struggle, due to over spending, still it's not that unreasonable to discuss possible future changes, that could enable teams to get part of the money, for their operations, based on results and from other streams, then sponsors.
Yep, listen to assholes like Plugge who tell you this thing is so UNSUSTAINABLE!
Nah, that was my take on it. But maybe i was wrong on this one. As there is still enough oil, sugar, alcohol ... to sustain a model, on where top teams can have 50 million and up annual budgets.