I've made more than $1000 on more than one program (discover deals, shopathome, possibly splendor or close, somewhere in the same range on topcashback). None of those have per transaction or total limits.
I don't spend on travel, though, so rules may be different there.
I resell, so I'm also explicitly excluded from jet's program.
I wouldn't expect the average consumer to be a reseller, but that's an interesting point to consider.
Travel is a heavily restricted category. I wasn't able to find complete terms and exceptions for all of the programs you mentioned quickly, but for example, TopCashback caps flights from Orbitz at $3 [0]. Discover Deals doesn't seem to support flights besides one weird deal with CheapOAir [1].
I don't spend on travel, though, so rules may be different there.
I resell, so I'm also explicitly excluded from jet's program.