Like PhaseNoise said, if you are accepted to UT off the waitlist and decide to attend there instead of A&M all you would lose is your enrollment deposit(if you have already paid it).
Personally I know of 5(there may be more I don’t know of) students from my school who already cleared the waitlist. However it does seem like the main batch of admitted students have already cleared the waitlist and they possibly will only be accepting very few from here on out…
There was also a thread that was started earlier about this year’s waitlist: http://talk.collegeconfidential.com/university-texas-austin/1756834-2019-ut-waitlist-is-moving.html#latest