I looked into this, becasue this was a concern of mine as well when I noticed the burn address wasn't the typical all 0's. So I went ahead and did the math on it just to make sure no funny business was happening and here is what I came up with.
ETH address space = 2^256
An address with 0/1 in every spot address space = 2^64
2^256 / 2^64 = 2^192
31,536,000 seconds in a year... let's give the devs, oh 1 million years to find one?
that would be 31,536,000,000,000 seconds. Now lets see how many address per second they'd need to guess...
2^192 / 31,536,000,000,000 = 1.9+E44 per second
Current hash power of the entire ETH network is 179.44 TH/s = 179,440,547,778,901 h/s
1.9+E44 / 179,440,547,778,901 = 1.10926E+30
So, they would need 1.10926E+30 times more hash power than the entire ETH network, and then in 1 million years they can find that address.
I think the choice to use that address was so people could easily check that address and see what was burned *only* for VETH rather than the general burn address which would have a bunch of other stuff mixed in *shrug*
I also tried doing binary to ascii to see if there was some significance to the 0's and 1's like if it said "veth" or something but didnt have any luck