A: No. Twitter allows single links in bios. As long as your mega-link landing page does not violate Twitter's policy on spam or misleading destinations, you are compliant.
Consider the failure points of traditional linking: Vgk-mega-link-twitter
: If you see accounts with random strings of numbers or blank profiles posting this exact phrase, they are likely part of a coordinated spam campaign. Vgk-mega-link-twitter