Does buying fraction shares a form of DCA?

I believe you are looking at the US market stocks.
Typical lot size in US markets is 1 share.
But the price of one stock share for some companies could be a high entry barrier to investors.

In that case, if you have access to platforms that allow fractional stock investing at reasonable cost, you could do regular investments into those stocks that you are interested in. And over time you build up your holdings in that company. So yes it allows you to start small and accumulate over time.

To me, it is the same as DCA just at a smaller level.

1. No, buying fractional shares is not a form of DCA.

It just means that you are buying the same shares but at a lower price point while still being able to track the price of the stock and participate in it.

2. For subscription services like Adobe and high volume relying business like Amazon, it would require massive scale in order for them to be profitable.