To be clear, Foundry VTT does not scrape DDB for anything.
There is a module, not made or written by Foundry VTT but by a patreon (Mr. Primate) and another, much more limited patreon ( VTTA, which is free), that allows someone who has a DDB account to access their own material on DDB that they own and paid for (and only the DDB material they paid for) to have that imported into their game.
WotC is not harmed by this in any manner. Indeed, I happen to know for a fact that WotC has been enriched by this, FAR more than the author of Foundry VTT ever has.
I do not dispute that WotC is probably aiming at Foundry so that they can persuade people to use their own forthcoming VTT via DDB.
In so doing, they will cause more harm to their own bottom line than they will do to improve it. In just the past nine months alone, I know that WotC has received more than $400 from me for products/services purchased on DDB. The ONLY reason I paid that was for use in Foundry VTT. The marginal cost of that to WotC was approximate one or two cents. It was essentially all pure profit to WotC-- all of it.
If this transpires as we believe it likely will, these will not be rational business decisions.