The game may or may not do well but family member being an escort is like the least important factor.The DEVELOPER specifically asked for player's thoughts (both positive and negative) about HIS game. It's a shame that YOU have a problem when someone does so. This game will not do well if it is an incest game and the family member involved is an escort.
I noticed there are titles on F95 which have lots of positive reviews(4+ overall rating), feature no NTR(in it's most asinine, broad definition) yet earn peanuts on Patreon.
It means the very vocal harem-enjoyers dont seem too keen on supporting the devs that cater to their tastes.