Yeah I can't tell you how many Twitter/X profiles say 'this is my [xth] account' or some variation thereof. I think the record I have personally seen is '18th' or '19th' (today I blocked someone who's profile stated they were on Try # 14)
Most people just launch another burner email (I don't think they're checking IP addresses or SIMS, at least not in the USA)
On what criteria? IP address? User-agent? Easily spoofed.
Getting a burner SIM is tricky depending on where you live (Mandatory KYC is required in some countries)