It seems like you've misunderstood this feature of Google Assistant. Now Playing is a pixel exclusive feature that works in the background without triggering assistant and shows the currently playing song on the lock screen and always on display. It seems like OP is trying to trigger this feature from the foreground? Which I think would be a good feature but I doubt Google would let any phone use this cause profit. So I guess this is still fitting for mildly infuriating lol
Now Playing is a pixel exclusive feature that works in the background without triggering assistant and shows the currently playing song on the lock screen and always on display. It seems like OP is trying to trigger this feature from the foreground? Which I think would be a good feature but I doubt Google would let any phone use this cause profit. So I guess this is still fitting for mildly infuriating lol
Yes, you are allowed to licence open source software which allows for different limitations. Common open source licences you'll see a lot of are Apache 2 which is what the Android Open Source Project uses, or GPL v2 like the Linux kernel. There are plenty of explanations online about the different licences and the limitations they impose on distribution of a piece of software.
Yes I'm sure. Ultra is only available annually or monthly. Annually it's $28 here
Edit: I stand corrected. Just got the new update with ultra lifetime as an option. That's $170 though.