Pre-first guests ...the prev owners had a 48 hour cancellation period, and never took a cc to hold a room. (No online rez or anything like that, she had index cards which she took with her so we had no record of any guest every stayin ghere)
I had a whole house booking over graduation weekend, for a wedding. It was a small town pastor's daughter getting married and everyone knew them, so there was, as I was told by the PO's no need to get a cc, we can trust them.
They ended up with only one room in the end for grandparents and cancelled them all within the policy of 48 hours, and we had one room that weekend instead of 10+. We were going broke fast. Pouring money in and not getting any out.
I had to oblige those policies as the bookings were made before we bought the BnB. I still cringe at the thought of it. The PO's ran this BnB more for events than for the BnB, the BnB was a side job. They were numbskulls.
I also inherited a small wedding that grew and grew - the bride would call from Idaho nearly daily, the groom would stop in with his parent as he was blind. They decided the ultra incredible deal I was giving them wasn't good enough. I AM SO glad that happened, we were trying to be nice, we were new in town. I kept a deposit on them and they used it to stay here on their wedding night. This couple broke our brand new bed (not from...you know) but because they were both very overweight and the slats under the bed could not hold. Got a call at 2am after a loud crash.