there are key additional phrases that subtly make it different, like the fact, that this is transferable. And though not uncommon, using the term "provision of service" leaves the door wide open to your contents usage, because the lisc. is non-revocable, and perpetual.

If say, in 3 years from now as a provision of their service they offer analytics, or direct marketing. they can use any of your content for that.

I get this is probably just a wide net they are casting to not box themselves in, but it's something that is super restrictive to the user. And being as they also have a section require arbitration, and barring class action suits.

If they are acquired by, or decided become a bad actor, then you are pretty much SOL.