Yes I know there is no LICO for visitor visa invitation because the commitment in the visa invitation is a courtesy not like the sponsorship but if three persons will come from overseas they will for sure cause a financial hardship for the hosting family, it is not logical for someone who can’t pay for their tickets or day to day living to travel for tourism.
That happened already when they travelled to US, searched for work and ended up in debt. That is why I want to prevent it before it happens in Canada.
In that case the hosting family should simply let them know that they don't have the means to host them or support them in any way while they are in Canada. The visiting family will have to cover all expenses on their own. The hosting family will only end up in debt if they chose to end up in debt. No one is forcing them to cover the costs of the visiting family. That's their personal decision.