This reminds me of junk furniture my stepkids find for cheap/free at a yard sale and then bring it to my house to fix.

If it were me, I'd get some 1x4s, rip it to 3" wide and use that to make an apron under the table to connect the legs to each other. I'd run screws through the side of the leg and into the end of each apron piece, plus epoxy glue on the apron ends that contact the legs), and then glue/screw the apron to the underside of the table.

You do that, and it's not going anywhere. And that is about as cheap as it gets without having to replace the legs.