So Venom will not be”R” rated to allow for possible future tie-ins of MCU movies
https://mcuexchange.com/venom-rated-r-mcu-crossover/
Also from the Marvel Wiki –
Outriders (the creatures that attached Wakanda in Infinity War –
“Outriders are not born, they are made. A genetically engineered parasite-assassin solely devoted to the whims of its maker. These creatures have no names, just a binary existence defined by whether they complete the task given to them, or whether they fail. “
Don’t that sound like the symbiotes?