Strikes are historically short affairs and even then historically your strike fund contributions aren’t as high as 1/15th of your pay. That’s closer to the whole of your union dues (UAW was iirc an hour and a half a month when I was in it for everything). Union dues aren’t just strike fund, it’s wages for leadership too. Your leadership members work so many hours for the boss but another so many hours for the union and their pay is split between the two.
Then it’s unlikely that your strike fund is in a serious investment holding account. Those require you to hold your money in them for a certain amount of time or they’re volatile. You need to be ready to strike at a moment’s notice because the boss can fuck you over that fast. The point of this is to say that it’s unlikely it’s keeping up with inflation much less the rising rents of California and New York.
In an industrial union for example it’s unheard of to strike for that long because both sides are burning money during a strike. The difference is that here it’s tech companies who have an ideological opposition to unions and are willing to burn money left and right to not negotiate fairly with labor.