I agree, that is what I suspected.
Once you use it and like it, you are trapped
That is why they make student licences free, to catch them in their web (M$ do the same/similar)
I don't think that Affinity is a copy of PhotoShop, they all look similar, obviously, if anything Affinity is closer to Corel, they way things work is quite similar.
I started using CorelDraw in 89/90 for typesetting and layout (wasn't called DTP yet), even did 4 colour separations on a 486 (took more than an hour

) Everyone else was using Pagemaker on Apple. PC worked and s did the job, and we had to send out very little.
Another huge advantage (to me) is having Affinity Design and Publisher integrated so well
In a way, they are serving two different markets, and I think for the majority, Affinity will do all they need.