Compare with the following, efficient but restricted, if we specialize it:

Use this program only if you trashed any of your installed cards this turn.

Interface → [$1]: Break up to 2 sentry subroutines.

[$2]: +3 strength.

In Startup right now there aren’t a lot of options for Anarchs when it comes to in-faction Icebreakers. It is this or Mimic. As Mimic has difficulty dealing with strong Sentries, it is nice to have this card as an option for Anarchs to run for no influence cost alongside Mimic in case the corp puts out something scary like Cloud Eater.

On efficiency, Boi-tatá pales in comparison to Mimic on most of the Sentries with 0-3 strength even if the Runner has trashed a card. The only weak Sentries it handles at a better rate are Tithe and Rototurret - and even then only if the Runner has trashed a card.

When looking at Strength 4 Sentries (Ansel 1.0, Ballista and Hammer), Boi-tatá runs into the awkward issue of those ice having either 1 or 3 subroutines. It is therefore particularly bad at fully breaking them when unsupported by a trashed card (5 for Ballista, 7 for Ansel or Hammer), though after a trash it becomes a much more palatable 3 or 4. However Mimic supported by Leech or Ice Carver can do the same job for 1 or 3 credits.

Then there are the big boys - Archer, Cloud Eater and Seraph. These three are tricky even for a supported Mimic to break. Boi-tatá without a trashed card breaks these for 10 which is awful but at least possible. With a trashed card though, it can break them for 6 which is a pretty excellent rate (Carmen - queen of Killers in Startup - needs 8 for Archer and 7 for the other two).

So for Startup a single Boi-tatá as an accompaniment to Mimic could be worth a look just as insurance against the big Sentries. It helps that the strength-lowering effects that are strong with Mimic deck are also quite good for Boi-tatá since they can help it overcome its biggest weakness in how inefficient it is to pump it against Sentries 1-2 above its strength.