Well because the world of patreon funded games is an unwatched and unregulated mess. You have plenty of creators milking their patron, effectively being small time conmen.
The abandoned tag is to make people be wary of funding such people and also as a small "whip" to actually force creators to do something.
Personally I think its great. I know people in this thread ADORE the dev, but from a certain point, even here some doubt can be found. How much did you actually see from the new update? I followed a game where a dev kept posting "progress bars", turned out it was all bs.
Personally I do not think that naughy road is a scammer, but the abandoned tag system is only a plus for the health of porn game "market". Also I am not sure about others, but at least having some form of deadline helps with time management. Definitely does for me, the bigger the time frame you have, the higher the chance you waste time.
Really, I understand the sentiment. I also understand why there is a need of an "abandoned" tag in F95. At the same time, I don't think there is a catch-all solution for marking a project as abandoned, especially in absolute terms (the "x months since" model) - the ideal way should be a per-project basis, but it leads to another quagmire ("who watches the watcher" and so on).
The only solution, to me, is: if someone is interested in a project, he should simply follow the "news", stay updated, and form his own informed conclusion. Trying to convince others of your own views about development times and work ethics is mostly a waste of time and leads only to bandwagoning, infinite bickering and witch hunts (please note: this is true for both supporters or loathers). This is especially true in a relatively new and burgeoning sector like Patreon, which by its nature shortens the distance between developers and patrons - with all the good and bad this entails.
Of course, blatant lies on both "sides" - by the author, or by anyone else about the author - should be highlighted and discussed. But since it is not the case of naughtyroad, who has always been crystal clear about his intentions and proceedings, this is a different issue altogether.