Thank gød I did not start dumping my valuable photos into Flickr, but used Google Photos instead with 260 thousand pics.
Flickr has "conveniently" hidden the statistics, but last time I saw my number it was 1450. Quite easy then to prune duplicates and shit pics off as they will delete older and more valuable photos first. Correction: The number is visible on computer screen but not on the phone. I have 1339 now after some pruning.
The original 300 photo limit was actually quite ok. If I had some bigger collection to show, I just used one Flickr pic to advertise Google Photo Album.