Maine can certainly disenfranchise its voters. Granted this only passed the Maine Senate at this point, but if it becomes state law, then Maine doesn't need to vote for President any more. They want the rest of the country to decide for them.
"It would only take effect if states with enough electors to decide a presidential election adopt it. The jurisdictions that have adopted it now account for 189 electors, which is 70 percent of the 270 votes needed to create a majority of the 538 members of the Electoral College." - Bangor Daily News, 14 May, 2019.
They do expect it to pass the House, too. I am not sure how I feel about it. I would have hoped for a compromise instead, where the other states handle their electoral college votes as we do now. I live here in Maine, and right now, I am not impressed. We have other, more pressing issues to take care of, and instead we have this.