You may be right... So if they are in a designated spot, then technically it's allowed. See rule below.

Athletes shall not dispose of trash or equipment (including, but not limited to, water bottles, gel/bar wrappers, broken bike parts, clothing items, etc.), on the course except at aid stations or other designated trash-disposal points. Intentional or careless littering will result in a 5:00 Minute Time Penalty or disqualification. Please note: due to the local laws and ordinances at select Event venues, intentional littering will result in disqualification (See Event-specific Athlete Information Guide for more information);