I am not a full-time photographer; there are runs of time every year where I spend a lot of of time shooting (e.g. live music gigs), and then long periods of inactivity.
I have over 1000 photos on Flickr. I've been a user for over a decade. And I found out about this change from this post, because I haven't been reading the associated Yahoo email that often.
So, leaving my account alone for 3 months = losing most of my photos forever.
Great.
Just the service I want to pay for.
I understand the business need, but perhaps could you take it easy on irreversible changes? Sure, make the photos over the 1K limit unavailable even to the account holders -- but let them buy the access back long after the change.
Not only you might get more subscriptions from that alone, but there's also this:
Unlimited storage might not be feasible for a fixed pricd. Photos are growing larger, dollar is getting cheaper - we're betting on HDD costs going down, but that's not a given.
You might need to have a change in the future.
Again.
And I don't want to lose data because I'd have missed that announcement - just like I missed this one.
How you treat your free users indicates what the paying attention ones can expect.
Please, for the sake of everything that's holy, give your devoted users some goddamn peace of mind that they can camp in the mountains for a year and don't return to see their data gone.
Yahoo! screwed up there - but two wrongs do not make a right.
Not all of us use the service every day. Take it easy on annihilating work and memories.
TL;DR: every account whose data you keep is a potential subscription. Every user whose data you deleted is a guaranteed loss of business and eternal scorn. Please take care of your intermittent, but devoted users.