@Debra48
Yes, true, there is no harm in asking and I have also managed to get some unsuitable guests to withdraw their requests from time to time. It's definitely worth a shot.
However, I still find that there are three different types of guests in this respect:
1. Guest who reads and digests everything, sends you a nice introductory message with the info you require and you barely need to ask them anything (or maybe nothing at all) before accepting the booking. This is a rare bird.
2. Guest who has read some stuff but has missed the extended house rules and needs to be reminded to look for them in order to answer the Easter egg question. They are happy to do so once pointed in the right direction. Occasionally, once this guest has read everything, they realise it's not a good fit for them and withdraw, or they ask questions that make you realise it's not a good fit. You ask them to withdraw and often they do.
3. Guest where it's like pulling teeth. No amount of reminders/prompts will make them read anything or answer your questions. Problem with this type of guest is that they are unlikely to respond within the 24 hour timeframe, but even if they do, they do not answer your questions. This is the guest you want to withdraw the request, but you cannot get them to do anything at all, so you just have to decline them. It's painful, but necessary.