Yes it is, and it will be forever. Most features regualar people need are included in the free package.
Yes, you can cancel your subscription anytime. You'll keep your subscription until the next payment is due.
No, Instagram does not want you to, also, It's not usefull at all because you can't tap them.
Sure you can. Unlimited links are included in both the free tier, as well as the PRO tier.
Ofcourse you can. Each link can be deleted or simply be hidden from the public, when a link is deleted, you also delete all of it's analytics.
You can easily reset your password on the Forgot password page!
You can do so by going to the advanced settings, at the bottom of the settings page. When you delete your account, all personal data we have on you is deleted as well, as it should. This of course is not reversable.