Yeah I have a problem with it, you're recommending someone to travel from London, England, to Warsaw, Poland, (To which you think it's possible said flyer would have get from one airport to another airport across town). Then from Warsaw to Lisbon, Portugal, on to Toronto, Canada. So, travelling through a possible FIVE airports, and bounce through the named countries. At a time when travel should be kept to a minimum, and only if it's really needed at all! Just to save a few quid. To get from London to Toronto can be done one way, for £90. London - Dublin - Portugal - Toronto Still not great, but for £8 more, it's less travel time and at the very least one less country, and not having to travel across town for those that are just wanting to get home to Canada.
Self transfer across Warsaw, and relying on Ryanair = big risk. If you missed that flight out to Toronto, you'd be out of luck
Good price in normal times, but multiple spots of potential COVID exposure just wouldn't be worth it for this bargain.
Wouldn't rely on a connecting flight from London these days anyway, and not one with Ryanair.