eh, whenever someone comments on my tiktok ads with "This is cheaper on X website" I just hide and block the user, also I only need to have a few "blocked words" to prevent this from happening at all.
It's a good idea because you don't need to spend anything and you can get a few bucks per conversion, but you would have to keep recording new videos almost daily.
Once you have some spending money available I would suggest hopping the fence and becoming the affiliate marketer on the other side, selling products with enough margin to get a good chunk of payout.