A hosting provider, which only lasts 1-2 months long. Most of the creators of "summerhosts" used free panels (like pterodactyl panel), themes, and scripts. Those summerhosts were usually hosted on their own cloud server or they ask another person to host their "hosting provider" on their server. They not only made Minecraft host, but they also made a VPS host. Usually they didn't charge anything for the use of the host, which made the host ended up bankrupt or closed after a short amount of time.
Look at him, he started another summerhost!