Still seems to be the case with WebPlus and PagePlus. Parents get pestered for upgrades and they make the upgrades compelling, such as having been kicked onto Win 10 by Microsoft, guess what, the old versions they have aren’t supported and sure enough there are things that are broken. Fix? Yep, upgrade. And because they skipped a version, then it’s full price.
Their model is based on promoting the cheapness of the stuff, even giving them away initially, but they do frequent new versions which you seem to need.
Not sure with Affinity. Free upgrades at the moment, but it goes against their business model. I’d doubt you’ll get the full version after the beta version expires without paying.