If they're storing raw data without parameters, you can't have any confidence they do that with every other SQL query. You'd have to block every SQL token from every input.
Imagining we're happy to sacrifice these words to the gods of security theatre, what layer are you suggesting this goes? Browser level just means hackers can make raw requests. HTTPDS could block it, like an overzealous WAF, but that still needs implementing. Service providers shouldn't be able to see this stuff because of transport layer security.
There's no sensible way to make this make sense.
I do agree that a lot of entities are not adequately prosecuted for their incompetent data handling but fixing that seems far more realistic than banning the word "drop", everywhere.