Hey, owner & CEO here. Reading this now, but AMA.
To some degree I only still pay for it out of nostalgia for what it was. I stopped using it when it started trying to upload my entire camera roll every time I opened the mobile app - Flickr was never about storing all your photos on someone else's server, it was about curation and community. It somewhat lost that as phone photography got more popular, and instead of empowering users to do that directly on their phone, it presented itself as a mere backup utility. The app seems to be entirely non-functional now, no content loads at all for me. Flickr's failure to move with the rise mobile photography feels like its biggest misstep - age verification for an account that is 22 years old though might actually convince me to stop paying. I'm not using it, the mobile app is broken, and now it wants to hand my PII to a third party.