@sabhob, like you then we have completed a bunch of housesits that have been mostly positive. Some spectacularly joyful experiences. A few undesirable learning experiences. Two sit cancellations. One recent housesit involved a perceived major policy breach that we reported to THS as a Member Dispute.
We believe that most people - Pet Parents and Housesitters - on THS are good people. But there are exceptions, perhaps on both sides. Hopefully the two-way, blind review process weeds out some bad actors - but this does require someone to suffer.
A simpler way to catch bad actors is through appropriate due diligence. Before confirming a housesit then both parties should assess their counterparts. Ask questions. Consider red flags. Clarify important details. Initiate relationship. If concerns persist then walk away. Ideally any bad Pet Parents are unable to confirm a housesitter, and any bad housesitters are unable to secure a housesit listing.