Unsure what comes in the install pack these days but back in 2015 it came with a wee squeegee type thing that once the tape was installed, you dragged along it to remove the excess water but also move any air bubbles to the edges and then remove them. Installation can be straight-forward if you have a lot of time and patience, I’d guess a bike shop is short on both so it isn’t such a time-consuming job, so it might not be as carefully installed and then ‘squeegee’d’…
However, I’ve seen quite a few bikes invisiframed since then done by individuals and by shops and some of the finishes do appear to be hit or miss in terms of amount of air bubbles that are left. The ones that look like there is no tape over the bike seem to be the ones done by individuals with plenty time and patience or by shops that seem to do a lot of them.
If I’d paid someone to do it I’d be unhappy but probably not unhappy enough to look to get it redone. If it was myself, I’d be annoyed that I didn’t get it sorted and may try and fix it.