What that ad does NOT say is whether Zillow would have a competent home inspection done to determine condition and a list of needed repairs. If such an inspection is part of the plan, then the question is whether the Zillow offer has a long enough fuse on it to give the homeowner sufficient time to shop that offer with other such competing “we buy houses, as is” people. [Dan Franklin in Dallas is still running late night radio ads saying he will beat any other offers you have on your as-is house, for example.]
If that Zillow fuse is too short, it’s a big warning that they’re afraid of competing offers.
If no home inspection is part of Zillow’s plan, then you have to assume they’ve built in a deep cushion in their offer that will maximize the damage to the homeowner’s hide.