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.

$34 dollarydoos here 🦘