(I just had one service I'd trialled & forgotten about ask me to arrange a ... VIDEO CHAT to cancel runs screaming)
But also - if that's what customers are doing, your cancellation button probably isn't as obvious or findable as you'd think (or people lose their passwords). And if you're a small SaaS shop, you probably don't have the time or energy to workshop the whole cancellation experience :)
idk, there's no right answer but "baffling" customer behaviour is always an opportunity to improve what you're offering.