Rover (and Wag, Pawshake, and similar gig-economy pet-care apps) work great for one specific use case: short visits. A walker comes by twice a day to take your dog out. A drop-in sitter feeds your cat. The model fits nights out, weekend trips, and busy weeks at work.
But for actual travel — a 2-week holiday, a month abroad, an extended business trip — Rover gets expensive fast and doesn't fully solve the problem. €25-50 per day adds up. Your pets are alone overnight. Your home is empty. Mail piles up. Many pet owners pay Rover for a week of visits AND board the pet for the second week.
Housesitting solves the multi-day/multi-week trip problem in a different way: a sitter moves into your home for the whole trip. They feed your pets, walk them, stay overnight, water your plants. The exchange is free — your home is their accommodation, your pet care is the trade.