Implementing effective security does not always require premium services. The following free measures can significantly reduce attack success: Server Software Optimization : Switching to
If you are looking for tools to your own server's resilience, these advanced bot frameworks are available: minecraft bot attack free
Then run /whitelist add [your_real_players] . Bots can't join without being on the whitelist. This is a for small servers. which the free plan leaves exposed.
Services like Cloudflare’s free plan – only HTTP/HTTPS. Minecraft uses raw TCP on port 25565, which the free plan leaves exposed. minecraft bot attack free