Imagine this:
You are a Computer Science enthusiasth, signed up for Construct in the early days, last year you decide to get your personal license and it is price to you at 2.19USD. You work 5 months with this price then pause it because of December.
Back in January, you decided to get back to your Construct account and when you are about to renew your license, Bam! Boom! Kappoo!! you are hit with a 19.99USD price tag out of knowhere.