I was just using the mowing thing as an example. You would be able to use the website to see any tenders for services you could offer. It could range from dog walking, auto repair, carpeting, child care, basically any service you can think of. The website isn't designed to cater towards any specific jobs like Uber, Lyft Fiverr or Freelancer. It's meant to be a universal platform where anyone could offer services safely and with a form of security. You could also request services if it's not available.
Will you offer insurance like Uber does? How will you vet the babysitters? You don't offer security - just accountability.
The platform will just be a mediator in a sense. It's each person's job to make sure they're qualified to actually offer services within specific categories.