This one is a relatively new offering. But be warned and keep in mind that fractional shares may be handled differently from broker to broker. And thats why its very important to do your research and check each broker or at least a lost of brokers to see what’s available.
There are a lots of good brokers which you will find. But a lots of them offers different things. Like Fidelity offers fractional shares for virtually any stock listed on a major exchange. And another broker named SoFi Active Investing offers you a limited list of stocks and ETFs from which to choose.
The answer to the question is no. Many brokers offers different or even similar things to each other but they are not the exactly the same rules and things which they offer.