The server has now been updated to 1.15. This is a relatively minor update, so I've seen no major issues with plugins or the server like I saw in 1.14. The map has not been reset. It's the same one that was used in 1.13 and 1.14. You can enjoy your bases for longer :). Or move to a new one anyway. I will probably reset for 1.16 because of the new nether biomes.
I haven't bought the game but i want to play in the server, how can you make an exception? :c (If you want to go offline mode there are plugins that make you solve a captcha first before registering)
I cleared ~50 pillagers that were hanging around spawn and other nearby areas within a few hundred blocks. The problem was getting pretty bad ... should be safer to explore now.