Yeah, just OSS. Which is fine by me, frankly. In a capitalist system there are very few ways to make FOSS soft compete with closed source/proprietary. One way is to convince people to buy the soft. Another is to get industry funding. Blender is one of the best examples of this. But Grayjay can't use the Blender model because the biggest player in the industry (Youtube) has a vested interest in keeping the app from being developed.
Grayjay and other Futo apps are not really paid software, it's more like a donation. No reason not to use a FOSS license.
But Grayjay can’t use the Blender model because the biggest player in the industry (Youtube) has a vested interest in keeping the app from being developed.
What does that have to do with the licensing? The restrictive definitely won't stop Google from trying to shut the app down. Selling the app actually makes it harder to prevent it from being shut down. Google can now argue in court that Futo tries to make money from selling this app, that uses the YouTube API without authorization.
There's a very easy solution to this problem: Just make it FOSS like every other god damn alternative YouTube client, put the GPL on it and treat donations like donations, instead of "selling" the app and generating revenue (which can and likely will be used against them).
Rossmann and Futo have explicitly stated that purchasing their soft is a purchase, not a donation.
Exactly. That's the issue. Selling software means generating revenue, thus Grayjay is a commercial product. That's exactly what YouTube Vanced was shut down for. Generating revenue from accessing YouTube in an unauthorized manner. Grayjay does use the YouTube API, but not the official one. YouTube has 2 sets of APIs. The official one with clear terms and conditions, which is only accessible with an API token, and the unofficial one, which is for example used in the YouTube mobile app. There is no official documentation on this API, and it was only discovered through reverse engineering. YouTube doesn't allow using this API from an unofficial client (they're not that strict about it, but nonetheless, it's technically forbidden, as the APi is not meant for public usage).
Unless they were to stick a TOS, usage agreement, or API key requirement on Innertube then anyone's free to use it however they like. Legally, Grayjay is in the clear here. And practically they're fine as well since altering Innertube to block Grayjay would mean that Google would have to alter their in house processes and that costs money.
And the difference there is that Vanced didn't have capital behind it while Grayjay does. Futo can fight Google in court, Vanced couldn't. Even if a company has no legal ground to stand on, they can still fuck you financially with legal fees and a drawn out case.
Web Video Caster can cast to a large number of devices, Chromecast included. It has a lot of companion apps too on several smart TV platforms, all for the sake of getting your media played back on another device.
SkyTube Extra has Google Cast support, but make sure to download it from GitHub (e.g. through Obtainium). The F-Droid version doesn't have the cast feature, because it depends on a proprietary Google library, which is not allowed on F-Droid.