No, not unless you want to play on a private server. It has all sorts of freemium / cosmetic stuff for you to buy and some that they give you automatically for playing the game. You can ignore this if you want.
If you enjoyed Fallout 4, Fallout 76 makes for a decent Fallout 4.5.
I only see Horace, Heroās Hour and Loom as Prime free games. Under the heading Free Games with Prime. Perhaps there are higher level Prime memberships? I should know how that works.
Ah darn, Glass Masquerade is a new game launcher Iāve never heard of. Oh well. I have to draw the line somewhere. I canāt keep forever getting more game launchers.