A pandemic virus circulating in the wild is an incredibly fine-tuned machine. Just mashing together integral parts from two quite different genomes is not going to result in a Variant that is tuned enough. In order to make a Virus virulent and transmissive, it needs to evolve through multiple, probably dozens of hosts, and only if that is on a broad scale, like thousands of such lineages, does it have a chance of success.
Even one lab leak isn't enough. The Virus would most likely die out on its own, if not it would get outcompeted by naturally developing variants. The risk of a lab leaking a variant in a way that it would outcompete natural strains is so miniscule compared to natural variants arising and doing the same, it's not worth mentioning.
Even one lab leak isn't enough. The Virus would most likely die out on its own, if not it would get outcompeted by naturally developing variants. The risk of a lab leaking a variant in a way that it would outcompete natural strains is so miniscule compared to natural variants arising and doing the same, it's not worth mentioning.