I fully believe that when a game stops being developed the Early Access tag should be removed but that's the extent of where I agree, anything past that is a problem strictly of the consumer who knowingly purchased a game that advertised itself as unfinished.

I would also agree that if you want to keep an early access tag at minimum you should be required to post developer updates using steams update log like many companies already do, and failure to do so will eventually result in your Early Access tag being replaced with an abandoned tag, that way it lets buyers know that the game is not a finished product and it's no longer in active development.

As for the sleaziness of abandoning a project once people have paid for it, I would chalk that down as they knew the risk upon buying the game since it was labeled Early Access. I think that it would be nice if the return window opened for 2 weeks when a game was abandoned to allow people who were hoping the project would go somewhere the ability to refund but I also think that neither company nor steam should be under obligation to do so since the consumer knew the risk going into it, plus I also think it would be kind of sleazy for those who got hours of playtime on it to expect that you'd get your full money's back, even if the project was discontinued