Like a lot of things, informal, regular babysitting got ruined by a few people trying to hustle it into a business. This seems to be happening to everything that can be gig-ified:
1. People once did X informally for friends
2. Someone realized they could charge for X
3. People start doing X over and over for strangers, turning it into a business
4. Some disaster happens because X is now a hazardous unregulated business
5. Finally, the government steps in with heavy handed regulation, and now only licensed businesses are technically allowed do X.