There will be security implications when Americans are hypothetically mostly using Chinese tech (Weibo, Didi, Baidu), should it leapfrog a kneecapped US tech industry - unless the US also bans Chinese tech - which would isolate the US and make it less competitive while ceding tech leadership in the rest of the world.
Also, all the botnet-, APT-, ransomware and CSAM investigation & disruption ops would be hampered when the #1 desktop operating system, #1 & #2 phone OS authors, #1 network equipment manufacturer,#1 social network and top 3 cloud providers are no longer under your legal jurisdiction
Biggest players in significant industries get measured periodically. Those who cross some threshold of those markets get warned. Then if they exceed some higher threshold must be broken up or reduce their share.
Also, all the botnet-, APT-, ransomware and CSAM investigation & disruption ops would be hampered when the #1 desktop operating system, #1 & #2 phone OS authors, #1 network equipment manufacturer,#1 social network and top 3 cloud providers are no longer under your legal jurisdiction