Although some color mottling on Phalaenopsis orchid petals is normal and a feature of particular varieties, in this case, the color mottling and fading does look like it might be caused by thrips feeding. Thrips are a commonly-encountered indoor and outdoor plant pest. In fact, there are probably thrips already on some outdoor flowers, just not enough to cause any problems or visible damage.

On Phalaenopsis orchids, thrips are most likely to be found on flowers, not foliage, so clipping off the flower spike and keeping the plant so it reblooms later (next year or perhaps sooner) might be the simplest approach, and you would not necessarily even need to treat the foliage with insecticide. If you'd rather get rid of the plant, then don't worry about any escaping thrips. Plenty of predatory insects and insect-specific fungal pathogens outdoors kill pest insects like thrips, and not all thrips species found indoors would survive our winters. Having the plant in a trash bag that's brought to the curb whenever you normally put it out is fine, and doesn't pose any significant risk to other plants, and any thrips that wind-up being left behind indoors for some reason (they're not inclined to leave the plant) will not cause any problems for food or other objects.

Miri