I'm very pro Adobe, but they're making it more embarrassing / difficult every day. For those of us that have been at this for a while, we'll remember that the name for Lightroom was "Adobe Photoshop Lightroom". This was the name for what is now the 'classic' software from v2 onward. Then, a few years ago, Adobe started screwing with the product names, confusing everyone. Today, we see the names are changed again and now "Adobe Photoshop Lightroom" is back and this name doesn't even mean the 'classic' software any longer.
What's more embarrassing is this "Adobe Photoshop Lightroom" app is designed to store your images only on the cloud. I can't even find that they'll break out the pricing beyond 1TB at about $120 over the $120 you're already paying annually the combined software packages (combined total $240 / yr, if prepaid). They explain there are even larger storage plans, but you can't get to see those prices without first having purchased the initial subscription.
For the average photographyer, this $240/yr would seem like a monumental waste of money, storing only 1TB worth of your images on the cloud instead of locally (or both). Just browsing, Carbonite will back-up your entire single computer at unlimited cloud-storage at $6 / month. A WD 4TB external harddrive is $110 and that would be picked up automatically by Carbonite for the same $6 monthly payment. Carbonite (and similar) will pick up all your image files, your LR catalog file, LR preset files, and your music, word documents, other software files, and so on and so forth.
See this link to the current Adobe plans, Aug 27, 2020:
https://www.adobe.com/creativecloud/photography/compare-plans.htmlAt this link, we see Adobe has in fact broken out this new app they're calling "Adobe Photoshop Lightroom" for a standalone $9.99/mth payment with 1TB storage. There must be customers where roughy 200,000 JPEGs / 20,000 RAW on the cloud instead of locally makes sense. But, I can't see how it would make sense for a desktop owner.
As described above by a few comments, using the 20GB is sufficient (or barely sufficient) for syncing images from a mobile device to the classic software on your desktop.