I wanted to create my own Minecraft server and ended up using MGServers' free servers. I wanted to ask if this company and their servers are serious and trustworthy, or do I have to worry if I create a server there that I will be hacked or that my laptop will get viruses?
You won't get viruses on your laptop if you get a server there. With free server, there's a disadvantage mostly those who want a certain number of players and you only have limited slots, too little RAM or cores.
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First of all: you don't have to worry about viruses.
The site or the provider is serious, yes. However, it is free, which means that the server is not the strongest.