The move is in line with their reputation. Handing out a bunch of research devices which come with a catch is a great way to exert more control and influence over vulnerability reporting, and skew the bargaining power when it comes to disclosure. I expect the motivation is largely genuine to encourage security research that bolsters their platform, but also stems in part from an increasing fear of PR ramifications outside their control.

"I'm handing out a bunch of water bottles; sign up here. The contents remain my property so when you're done please urinate back into them and return to me on demand."