Your last sentence about digital footprints is probably one of the least considered by students/youth today. I really liked Sarah Lalk's blog posting "Digital Citizen Campaign: Your Digital Footprint Matters" from Waverly Shellrock Schools in Waverly, Iowa.
https://www.wsrtech.com/blog/digital-citizenship-campaign-teaching-students-about-their-digital-footprint. It also has a great image of the 'footprint' idea with the statement below it "Unlike footprints in the sand, a digital footprint cannot simply be washed away."
This is something everyone often forgets and a simple reminder to students can be an opening to discuss more digital citizenship issues with students during a teachable moment.