We had a similar (but thankfully, less serious) thing happen with Rover. We booked a dog sitter for 4 days with a woman named "Leslie". When we showed up to "Leslie's" place, the lady who we met did not match the person in the photo, and barely spoke any english. We were on our way to the airport, so I really didn't have a choice at that point but to leave our dog (I realize now I should have done more vetting, or met this individual in-person ahead of time, but the person I booked - Leslie - had dozens of positive reviews). After dropping off our dog, we received extremely vague updates/text messages over the next few days, and no photos. Things like - "Your dog is doing great", "he is behaving so well", etc... Whenever I asked for a photo, they would say they'd send one the next day.
Needless to say, it became obvious that whoever was watching our dog was not the person we were communicating with. Thankfully, our dog doesn't have special medication, or a specific diet that we needed to monitor. Who knows what would have happened if there was an emergency, and we needed to get in touch with one another.
These services like Wag and Rover have literally one job, and that is to make sure you trust the individuals watching your pet. The response from Rover was completely thoughtless, and it was clear they were going to do nothing to investigate the situation. The fact that they don't care that people like this woman who clearly has some sort of questionable scheme going on just shows how little they care about protecting their customer's pets.