If you don't have any already: good. (Unless you like putting the Internet in the middle of things that shouldn't really need the Internet. Yes, my opinion--but also why many of us are here as opposed to some other platforms in the first place.)
A specific example is Ring. Samsung has an official partnership with them that allows integration with at least their doorbells (you can get button presses) and...at least formerly some sort of video on those and the cameras, possibly still now, but I'm not sure because I've never found a use for that in home automation. Nest is another (unless Google changed their mind about them, too...another thing I don't like: you're at someone else's mercy ). There are a few others. Hubitat doesn't not support cloud integrations; Samsung just happens to be a bigger name with more klout and a slightly longer history and has a few more, or at least a different set.
Hubitat has an Alexa skill, Google Home support, an IFTTT channel, Ecobee support, a Life360 app, and more, as an example of cloud services you can use natively. There are many more community offerings. Hubitat also offers its own cloud services, e.g., a way to use Hubitat Dashboard over the Internet for away-from-home control (some reviews of Hubitat often claim it's local-only; this isn't true, but the cloud components are optional).
Related: if you're looking for, say, a smart plug (or almost any device), Z-Wave and Zigbee devices that connect directly to the hub are your best bet. That cheap Wemo or Kasa or whatever WiFi plug may work, maybe with a cloud connection, maybe locally, but usually with a lot less ease than something that is officially compatible. (There's also in-between space: LAN integrations. Hubitat has several of these too, like Lutron and Sonos. The Hue Bridge integration is another. These work well, too.)