They were also backed by Tammany Hall, which at this period was a rather unpleasant organisation controlling local politics, heavily Irish-immigrant, with violence and corruption, so perhaps Yiddish printers (in a nascent immigrant community) didn’t want to get involved?
Here are some sources from the internets:
The first entry in what would become a crowd of Yiddish newspapers in America, Di Yidishe Tsaytung first appeared on March 1, 1870, a self-described “weekly paper of politics, religion, history, science and art” with the English title, “The New York Hebrew Times,” emblazoned above the Yiddish logotype. Its publisher was I. K. Buchner, like so many of the first Yiddish editors a Lithuanian Jew devoted to the subjects of the New Enlightenment. It took its editorial material from German and other European Jewish periodicals, and was quickly scorned by English-language Jewish publications. The uptown Jewish Times said, “Buchner’s Yidishe Tsaytung is a weekly publication written in the Jewish and German-Polish jargon, and its contents are as laughable as its language. It provides reading material entirely suited to the recently imported Russian Jews, and is a shining example of Middle Ages superstitions and naivete.” The paper, produced by lithography, cost six cents, and loyally followed the party line of Tammany Hall. It finally expired in 1877.
–from Live and be Well, Richard F. Shepard, page 186.
The first Yiddish periodical published in America, Di yidishe tsaytung, was founded in 1870 by J.K. Buchner. He generally published his paper, which was subsidized by Tammany Hall, prior to election time or when a sensational story promised high sales…Its masthead identified it variously as a monthly and a weekly, but as few as fifteen issues appeared in a period of seven years; at most three issues are recorded extant today. The first commercially viable Yiddish dailies were published in the 1890s and in 1917 New York City alone had five dailies with a combined circulation of 600,000.
From the Jewish Theological Seminary’s exhibition catalogue People of Faith, Land of Promise.
And that bit about “three issues are recorded extant today”…this is one of the perks of doing volunteer work in a rare book room…