I dont really think anyone would call the business models of Opendoor, Offerpad, and formerly Zillow "flipping." Yes, they did buy a house with the intent to sell it but imo the term flipping refers to a much, much smaller scale business that also includes fixing up the property in some way. That is not what iBuyers do.
Buying a house to make a short-term profit on the resale is flipping. You can cover it up with some marketing tech-biz baloney, but it is still flipping flipping.
In my local Multiple Listing Service, it can show you all deed history for a given property, it is most certainly labeled as a flip if anyone – iBuyer or no – buys and then sells within a short period of time, even if they don’t make profit. The intention is understood by all market participants.