This would simply mean your server gets pwned at the speed of light. There is no way you could ever keep up to date with every security patch across that many integrations on one public-facing server. The compute would be expensive too, but that would almost be an afterthought to the first problem.
I can copy code that parses the files from these projects without having to execute any programs ie. not actually opening any files. Or you could just set up two servers. Servers A recieves the file from the client and sends it to server B. Server B does not have any network access except to server A. It reads the file, and sends back a magic number to A indicating if the file is good or 0 if it is bad. If server A recieves any other response it wipes server B. This could also just be a VM. And yeah compute would be pretty high. This is just a way to completely solve the responsibility problem. (for one definition of responsibility, that is, which is open to debate, surely.)
