Is this a license with Adobe, or another PDF software company. There are lots of companies that provide PDF editing software, and some are "free". For very occasional use why buy if you don't need to.
PDF Expert does not come from Adobe, it comes from Readdle:
https://pdfexpert.com/
It is usually $140. It's on sale for half price currently from various sources, such as:
https://deals.bleepingcomputer.com/sales/pdf-expert-one-time-purchase-lifetime-license
The PDF editors that you are referring to, some of which offer their products for free, aren't what are called "true PDF editors." That is, they don't allow you to completely erase text in an existing PDF document and replace it with different text in the same style. They also don't have OCR capabilities. And they usually don't have advanced abilities to create or work with forms. True PDF editors currently are in the $130 to $180 price range.
It's true that for very light work with PDF's, you may be able to make do with some less expensive, and even some free products.
Apple's own Preview (which comes with the Mac OS) has a surprising number of features for working with PDF's.
Preview.app allows you to:
a) highlight (in yellow), strike through or underline text
b) encircle anything on the page with a lasso of any shape, size or color
c) add marginal notes (in a side column) of any length, anywhere in the document
d) add new text in any font, any color, any size, anywhere in the document where there is space
e) individual pages can be dragged out of or into the document or deleted from the document
f) convert to a PostScript file (which can be edited and re-converted to PDF with the right software)
g) add and edit hyperlinks in a PDF file
h) combine multiple PDF's
What you CANNOT DO in Preview (and in other free or low cost PDF editors) is move or alter any marks on the page whatsoever.