@getbookshelves Article states that Kobo lets you download... they do not, at least in the EU; what Rakuten Kobo delivers in NL is a captive portal link, not an ePub. I just ran smack into this last week, deleted my account with them, backcharged the book and went and bought it straight from the publisher (Baen, who has a rep for not DRMing their books)....
There are a TON of eReader programs for your phone; I had been thinking of getting a separate reader but realised I have my phone with me almost all the time, and being someone who doesn't always carry a bag, a booksized reader is... not convenient... _however_, for them as do, plenty of Android tablets, including eInk ones, that aren't tethered to any one potentially-enshittified company (except Google, and there are ways around that too... /e/OS runs on a number of tablets, not all of them Google or Samsung...)
Also, shameless plug for eBooks.com... they don't have *everything* but they have a *lot*, including some of the DRM'ed stuff... which *could* be a Kobo-like problem but *isn't*, as you still get the actual download *and* their reader app is quite good... and will also let you import from other sources, PDF or ePUB.
(One is bemused that Kindle is using MOBI as a format; that was the first format I ever read an eBook in, on an old Palm Pilot. That's been a minute... one notes that while PDF is older - 1993 vs. 2000 - Adobe (ptui) didn't open the standard for PDF until 2008..)