Geni Suggested Matches behind a Paywall is Not New.
However, I think there is an exception for the first matching to a Profile in the World Tree and possibly also to Matches Geni sees as in your Max Family and/or managed by you.
So although it has been the case for many, many years, maybe you did not bump into it before.
As a Basic Member you can still do merges. This gives various ways to do merges https://help.geni.com/hc/en-us/articles/229705547-How-do-I-merge-du...
With the exception of the last one, Tree Matches, all work just as well for Pro and Basic users. Tree Matches is the only one not available to you as a Basic Member.
Tho I read recently Geni has started sometimes sending notices to Basic Users with a Tree Match that they can actually access. So if you get an email from Geni with a Tree Match/Suggested Match, check it out.
Whether the Profile you Manage is Public or Private should have no affect whatsoever on this.
But - yes, Geni did change the default on deceased Profiles, so making a Profile Deceased does not always make it Public. So if you care which it is, always check.
Also, if you are seeing a Tree Match on a Profile that is Public, any Pro User can look and give you a link to the suggested Match, which you can then check out and merge using "Merge This Profile" in Profile View or Drag and Drop in Tree View (use links in link I gave for illustrated directions how to do it).
If it is Private, most Pros will not be able to help you if the Profile is Private.
(If you have a Pro in your Family Group, they can)